Prozipper ads: what it is and how to remove it
Prozipper is a questionable application that may be promoted as a useful utility for data compression without any losses. However, it can also be promoted as an extension for Google Chrome, Internet Explorer, Safari, Mozilla Firefox, Opera, and other web browsers capable of improving the web browser's performance.
Facts checked October 6, 2026. Removal steps tested on Windows 11 (26H2) and checked against Microsoft's and the browser makers' current documentation. Sections marked as our earlier report are the original text: they describe the threat as it was then and have not been reviewed since. The 2026 status, the removal steps and the questions are current.
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Prozipper ads: summary
| Detection names | No Microsoft detection name is known |
|---|---|
| Distribution | Not recorded in the old report |
| Damage | Not recorded in the old report |
| Name | Prozipper |
| Type | Adware extension |
| Symptoms | Redirects to an unknown domain |
| Removal | Scan the PC with security software to find and remove the malware and anything installed with it. Fortect scans Windows for malware and repairs the system files and settings it damaged. Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free. |
Show 6 more facts
| Evidence | 4 write-ups by security sites; details still limited |
|---|---|
| Domains | dieviren.de |
| Ads shown as | Redirects through ad pages |
| Browsers | Chrome, Edge and Firefox |
| First seen | 22 June 2020 |
| Facts checked | 6 October 2026 |
Is Prozipper ads dangerous?
From our report of Jun 2020 · not reviewed since
Prozipper is a browser-based application that may present its users with sponsored content
Prozipper is a questionable application that may be promoted as a useful utility for data compression without any losses.
However, it can also be promoted as an extension for Google Chrome, Internet Explorer, Safari, Mozilla Firefox, Opera, and other web browsers capable of improving the web browser's performance.
However, hundreds of people keep reporting that Prozipper uninstall is not possible due to the missing uninstaller and supporting files, such as prozip.exe running in the background. Due to misleading distribution strategies and unspecified performance methods, it has been classified as Potentially Unwanted Programs (PUPs) and adware.
The term Prozipper virus is not the one that suits this application as it won't perform malicious tasks. However, it's typical adware that can cause chaos while browsing the web. Since its main purpose is to generate revenue from advertising , users can start seeing a huge amount of intrusive pop-ups, banners, hyperlinks, and other commercial content, which once clicked redirects the browser to suspicious third-party sites.
Prozipper adware has been reported by many people for stealthy infiltration, irrelevant advertising, and difficulties in terms of removal. Our security team has initiated research on it and confirmed that the direct download for this application does not exist. It's distributed as an "optional download" or freeware and shareware on shady download websites.
While it may be represented as a useful tool seeking to improve the web browsing experience, upon the installation of this tool you will notice an increased amount of commercial ads on random websites. Prozipper ads are intrusive.
However, the bigger problem is not the ads and their intrusiveness, but the content that may be behind those ads. Since they are managed by unspecified third-parties who have the freedom to promote whatever they want, these pop-ups may expose you to malware-laden sites promoting apps like DNS Unlocker, SafeWeb, Auto Refresh, and similar.
Apart from advertising, the Prozipper virus may show some interest in recording people's browsing history. Ad-supported third-party apps, in general, seek to know search queries that people most frequently enter, websites they visit, ads they like, pages they bookmark, and similar information. However, sometimes the browser-based cookies can also record the IP address and some pieces of contact information.
Therefore, to prevent issues that adware programs can trigger, make sure to remove Prozipper adware without a delay. The longer this adware remains functional on the machine, the more content it can generate on the web. Since you can never know which of the ads are safe to click on, it's batter to disable all of them.
Upon malware removal, ensure the full system's optimization with scanner.


From our report of Jun 2020 · not reviewed since
More from our earlier report on Prozipper
- Adware; Potentially Unwanted Program (PUP)
- It's an adware that seeks to generate income via advertising.
- As soon as this adware infiltrates the machine, the web browser can start loading third-party ads on random websites, insert hyperlinks in random texts, cause intrusive redirect via third-party servers, etc.
- Nevertheless, it's advisable to remove Prozipper virus with the help of AV to ensure that malware has been eliminated with the whole bunch of supporting files.
- Adware can alter Windows registry entries, thus negatively affecting the system's performance.
Check your browser and PC
- Address:
dieviren.de
How to remove Prozipper ads
How to remove the Prozipper extension
Do the browser steps in every browser and profile on the PC, then check Windows for the program that installed the extension.
Step 1: Remove extensions you did not add
In Chrome open
chrome://extensions, in Edgeedge://extensions, and in Firefox the menu > Extensions and themes.Remove every extension you do not remember adding, especially search, new tab, coupon, PDF, weather or video downloader add-ons. Check every browser and every profile, because each keeps its own list.
If an extension has no Remove button or comes back, a browser policy holds it (see "Managed by your organization" in the procedure below). The pages are the same on Windows 11 and Windows 10.

Chrome on Windows 11: More > Extensions > Manage extensions. Full procedure with screenshots: Remove a browser extension
Step 2: Uninstall programs you did not mean to install
Prozipper rarely comes alone: it is usually installed by, or together with, a free program. In Windows 11 open Settings > Apps > Installed apps, in Windows 10 Settings > Apps > Apps & features, and sort by install date.
Uninstall every entry from the day the trouble began that you did not install on purpose, for example a download manager, a converter or a browser you never chose.
Keep drivers and entries from Microsoft, Intel, AMD, NVIDIA or your PC's maker unless you are sure.
Full procedure with screenshots: Uninstall a program or app in Windows On uGetFix
Step 3: Reset the browser
A reset removes what the steps above could miss:
- changed start pages
- site permissions
- hidden settings
In Chrome open Settings > Reset settings > Restore settings to their original defaults; in Edge Settings > Reset settings; in Firefox Help > More troubleshooting information > Refresh Firefox.
Tip: Bookmarks and saved passwords stay, while extensions are turned off and the search engine and start page return to the defaults.
Reset every browser on the PC, including Edge, which Windows 11 and Windows 10 always have.

Chrome on Windows 11: Settings > Reset settings. Full procedure with screenshots: Reset a browser and fix a hijacked search engine
Step 4: Scan the PC, then run the offline scan
A scan finds the parts of Prozipper that the manual steps cannot see. In Windows Security > Virus & threat protection > Scan options, start a Full scan and quarantine what it reports.
Follow it with Microsoft Defender Antivirus (offline scan) > Scan now, which restarts the PC and checks the disk while Windows and the malware are not running.
It takes about 15 minutes and works the same in Windows 11 and Windows 10. If either scan finds something, run the full scan again after removal until it comes back clean.

Windows 11: Windows Security > Virus & threat protection > Scan options. Full procedure with screenshots: Run a Microsoft Defender Offline scan
Instructions for each browser and system
The detailed steps for every browser and system this guide covers. Open the one you use.
Uninstall from Windows
Adware can be eliminated from Windows quite easily. However, the process can be triggered by some malware-related objects. If you have any problems with the Prozipper uninstall, try these recommendations:
Uninstall from Windows 10/8:
- Type Control Panel into the Windows search box and open the result.
- Under Programs, select Uninstall a program.

Uninstall from Windows 7/XP:
- Click on Windows Start > Control Panel (Windows XP users should click on Add/Remove Programs).
- In Control Panel, select Programs > Uninstall a program.

Remove the unwanted program:
- In the Programs and Features window, look for any recently installed suspicious entries, select them, and click Uninstall.
- If User Account Control appears, click Yes to confirm, then complete the removal.

Remove from Google Chrome
Chrome extension can settle down on your web browser in a suspicious manner and generating intrusive ads regardless of whether you want to see them or not. To stop annoying Prozipper ads, delete the extension completely.
Delete malicious extensions from Google Chrome:
- Open Google Chrome, click on the Menu (three vertical dots at the top-right corner) and select More tools > Extensions.
- In the newly opened window, you will see all the installed extensions. Uninstall all suspicious extensions related to the unwanted program by clicking Remove.

Clear cache and web data from Chrome:
- Click on Menu and pick Settings.
- Under Privacy and security, select Clear browsing data.
- Select Browsing history, Cookies and other site data, as well as Cached images and files.
- Click Clear data.

Change your homepage:
- Click menu and choose Settings.
- Look for a suspicious site in the On startup section.
- Click on Open a specific or set of pages and click on three dots to find the Remove option.
Reset Google Chrome:
If the previous methods did not help you, reset Google Chrome to eliminate all the unwanted components:
- Click on Menu and select Settings.
- In the Settings, scroll down and click Advanced.
- Scroll down and locate Reset and clean up section.
- Now click Restore settings to their original defaults.
- Confirm with Reset settings.

Remove from Microsoft Edge
Potentially dangerous browser-based apps have to be eliminated from the browser's settings completely. If you keep receiving ads while browsing with IE, try these steps:
Delete unwanted extensions from MS Edge:
- Select Menu (three horizontal dots at the top-right of the browser window) and pick Extensions.
- From the list, pick the extension and click on the Gear icon.
- Click Remove.

Clear cookies and other browser data:
- Click on the Menu (three horizontal dots at the top-right of the browser window) and select Settings > Privacy, search, and services..
- Under Clear browsing data, pick Choose what to clear.
- Select Cookies and other site data and Cached images and files. (apart from passwords, although you might want to include Media licenses as well, if applicable) and click on Clear.

Restore new tab and homepage settings:
- Click the menu icon and choose Settings.
- Then find On startup section.
- Click Remove next to any suspicious startup page.
Reset MS Edge if the above steps did not work:
- Press on Ctrl + Shift + Esc to open Task Manager.
- Click on More details arrow at the bottom of the window.
- Select Details tab.
- Now scroll down and locate every entry with Microsoft Edge name in it. Right-click on each of them and select End Task to stop MS Edge from running.

Delete extensions from MS Edge (Chromium):
- Open Edge and click select Settings > Extensions.
- Delete unwanted extensions by clicking Remove.

Clear cache and site data:
- Click on Menu and go to Settings.
- Select Privacy, search and services.
- Under Clear browsing data, pick Choose what to clear.
- Under Time range, pick All time.
- Select Clear now.

Reset Chromium-based MS Edge:
- Click on Menu and select Settings.
- On the left side, pick Reset settings.
- Select Restore settings to their default values.
- Confirm with Reset.
- This will disable extensions and reset startup pages but will not delete bookmarks, saved passwords, or browsing history.

Remove from Mozilla Firefox (FF)
Remove dangerous extensions:
- Open Mozilla Firefox browser and click on the Menu (three horizontal lines at the top-right of the window).
- Select Add-ons.
- In here, select the unwanted extension and click Remove.

Reset the homepage:
- Click three horizontal lines at the top right corner to open the menu.
- Choose Settings.
- Under Home, set your preferred homepage and new tab settings.
Clear cookies and site data:
- Click Menu and pick Settings.
- Go to Privacy & Security section.
- Scroll down to locate Cookies and Site Data.
- Click on Clear Data...
- Select Cookies and Site Data and Temporary cached files and pages, then click Clear.

Reset Mozilla Firefox
If clearing the browser as explained above did not help, reset Mozilla Firefox:
- Open Mozilla Firefox browser and click the Menu.
- Go to Help and then choose Troubleshooting Information.

- Under Give Firefox a tune up section, click on Refresh Firefox...
- Once the pop-up shows up, confirm the action by pressing on Refresh Firefox.

Delete from Safari
Remove dangerous extensions:
- Open Safari, click Safari in the menu at the top-left of the screen, and select Preferences.
- Go to the Extensions tab, look for any suspicious entries, and click Uninstall to remove them.

Clear history and website data:
- Click Safari in the menu and pick Clear History.
- Set Clear to all history and confirm with Clear History.

Reset Safari:
- Click Safari in the menu and select Preferences > Advanced.
- Enable Show Develop menu in menu bar.
- From the menu bar, click Develop and select Empty Caches.

Delete from macOS
Remove the unwanted application:
- From the menu bar, select Go > Applications.
- In the Applications folder, look for any suspicious entries, then drag them to Trash (or right-click and pick Move to Trash).

Delete leftover files and folders:
- Select Go > Go to Folder.
- Enter /Library/Application Support and remove any suspicious folders related to the unwanted program.
- Repeat the same check in the /Library/LaunchAgents and /Library/LaunchDaemons folders, deleting any suspicious entries.

- Finally, empty the Trash to permanently remove the leftovers.
Reset Internet Explorer
Remove dangerous add-ons:
- Open Internet Explorer, click on the Gear icon (IE menu) on the top-right corner of the browser
- Pick Manage Add-ons.
- You will see a Manage Add-ons window. Here, look for suspicious plugins. Click on these entries and select Disable.

Change your homepage if it was altered:
- Open IE and click on the Gear icon.
- Select Internet Options.
- In the General tab, delete the Home page address and replace it by your preferred one (for example, Google.com).
- Click Apply and then select OK.

Delete temporary files:
- Press on the Gear icon and select Internet Options.
- Under Browsing history, click Delete...
- Select relevant fields and press Delete.

Reset Internet Explorer:
- Click on Gear icon > Internet options and select Advanced tab.
- Select Reset.
- In the new window, check Delete personal settings and select Reset.

Stream videos without limitations, no matter where you are
There are multiple parties that could find out almost anything about you by checking your online activity.
While this is highly unlikely, advertisers and tech companies are constantly tracking you online. The first step to privacy should be a secure browser that focuses on tracker reduction to a minimum.
Even if you employ a secure browser, you will not be able to access websites that are restricted due to local government laws or other reasons. In other words, you may not be able to stream Disney+ or US-based Netflix in some countries. To bypass these restrictions, you can employ a powerful VPN, which provides dedicated servers for torrenting and streaming, not slowing you down in the process.
Data backups are important - recover your lost files
Ransomware is one of the biggest threats to personal data.
Once it is executed on a machine, it launches a sophisticated encryption algorithm that locks all your files, although it does not destroy them. The most common misconception is that anti-malware software can return files to their previous states. This is not true, however, and data remains locked after the malicious payload is deleted.
While regular data backups are the only secure method to recover your files after a ransomware attack, tools such as can also be effective and restore at least some of your lost data.
From our report of Jun 2020 · not reviewed since
Prevent adware from installing the system - start monitoring freeware downloads
Most of the potentially unwanted programs (PUPs) try to gain the license and enter official download sources like the Chome Web Store of Google Play Store.
Unfortunately, they often trick credibility scanners and settle down as legitimate apps. You should always keep this fact in mind and double-check the freeware or browser-based application on several sources before installing it.
Besides, you will increase your machine's security by installing free apps more carefully. Selecting the Advanced or Custom installation setup will require a few additional minutes to finish up the procedure, though you will be able to monitor the process and opt out of additional installers that come as pre-selected components.
Carefully read the License Agreement, Privacy Policy, especially the policies about data collection and collaboration with third parties. Remove check-marks approving the installation of additional components before hitting the next button and you should minimize the risk of malware infection to the minimum.

From our report of Jun 2020 · not reviewed since
Manual and automatic Prozipper removal explained
Prozipper adware is a type of application that may have Browser Helper Objects (BHO) that infringe the elimination process continuously.
An attempt to get rid of this application may trigger error messages saying that the app is currently in use, which is why you are not allowed to get rid of it.
To bypass any Prozipper removal issues, try to restart the system into Safe Mode. Dieviren.de experts recommend running a scan with AV to address all PUPs. Nevertheless, manual removal is also possible with the help of the below-given tutorial. Finally, don't forget to use a powerful optimization utility, such as regularly to maintain your machine's performance.
Questions about Prozipper ads
dieviren.de opens when I click links. What causes it?
When every click leads to dieviren.de first, an extension or a script on the page is rewriting the links. If it happens only on one site, that site uses aggressive ads; close it and use another source. If it happens everywhere, open the browser in a private window, where extensions are normally off, and try again.
No redirect in the private window means one of your extensions is responsible: remove the ones you do not know. A redirect in the private window too means the cause is outside the extensions, such as a notification permission, a changed search setting or a program installed on the PC. The removal steps in this guide cover each of those.
Should I worry about redirects to dieviren.de?
Worry less about dieviren.de itself and more about what keeps sending you there. A single redirect from a free streaming or download site is normal and harmless once the tab is closed.
Repeated redirects on sites that used to work fine mean something in the browser or in Windows changed, often an extension or program installed alongside other software. It may also collect the pages you visit. Remove the cause with the steps in this guide, and do not act on anything the redirected pages ask:
- no Allow clicks
- no downloads
- no calls
If you already did one of those, the matching section of this guide explains what to do next.
Why does Prozipper show me ads?
Because that is its whole purpose. Prozipper is an adware extension, and its operators are paid for every ad it displays and every click it gets. In this case the ads take the form of redirects through ad pages.
They are chosen by ad networks that accept almost any advertiser, which is why so many look like warnings or prizes. The ads are not a sign that your PC is broken or infected with something worse; they are a sign that something on it, or in the browser, has permission to advertise. Removing that permission or program stops them.
Do I have to clean every browser?
Yes, if you use more than one. We saw Prozipper in Chrome, Edge and Firefox, and each browser keeps its own extensions, notification permissions and settings. Chrome and Edge share the same extension format, so one installer can add the same adware to both, while Firefox has its own add-ons.
Check every browser on the PC, including ones you rarely open. If you sync a browser with an account, clean it while signed in, so that the removal reaches your other computers rather than the adware returning from them.
How do I know the ads come from Prozipper?
Look for redirects to dieviren.de. That is the trace Prozipper leaves, and it shows up as redirects through ad pages. Ads that appear on every site, including ones that never carried ads before, point to something on your PC or in the browser rather than to the sites themselves.
A quick test is a private window, where extensions are off by default: if the ads disappear there, an extension is responsible. If they appear even with the browser closed, the source is a notification permission or a program in Windows.
An ad showed a phone number and I called it. What now?
The number belongs to scammers, not to Microsoft or an antivirus company. If you only talked, hang up and do not call back. If you let them connect to the PC, disconnect it from the internet, uninstall the remote access program they used, such as AnyDesk, TeamViewer, ScreenConnect or UltraViewer, and run a full and offline scan.
If you paid or gave bank details, call your bank at once on the number printed on your card. Change any passwords you typed while they were connected, and report the call.
Can adware slow down my PC?
Yes. Adware runs in the background, loads ad scripts, opens extra tabs and contacts its servers, all of which use processor time, memory and bandwidth. Ad-heavy extensions also slow down every page, because they inspect and change it before you see it.
The effect is strongest on older PCs and when several adware programs arrived together. After removal, restart the PC and check Task Manager for anything still using a lot of resources that you do not recognise. Speed usually returns to normal once the ads stop.
Why didn't my antivirus catch Prozipper?
Many security products do not block adware or notification sites by default, because users often agreed to them, even through a misleading prompt. Notification spam installs nothing at all, so there is no file to detect.
In Windows 11 you can make Microsoft Defender block potentially unwanted apps: open Windows Security > App & browser control > Reputation-based protection settings and turn on Potentially unwanted app blocking. If notifications caused the pop-ups, no scanner will report them; the fix is in the browser's site settings.
Does adware steal passwords?
Ordinary adware is built to show ads, not to steal logins, and most of it never touches saved passwords. The line is blurry, though. Extensions that can read every page could capture what you type, and adware ads sometimes lead to phishing pages that ask for passwords directly.
If you entered credentials on a page reached through an ad, change that password from a clean device and turn on two-step verification. Otherwise, removing adware extension and clearing cookies is usually enough.
Will Fortect remove Prozipper?
Fortect scans Windows for malware and unwanted programs and repairs the system files and settings they change, and its free scan shows what it finds on your PC before you decide anything.
For Prozipper, follow the plan above as well: the browser steps take back permissions and settings that no scanner treats as a threat, and uninstalling the program that brought it removes the source.
Run Microsoft Defender's full scan and, if anything was found, its offline scan as a second opinion. If the symptoms are gone after the plan and both scans are clean, there is nothing more to do.
Sources
- Microsoft: How Microsoft identifies malware and potentially unwanted applications (read October 6, 2026)
- Dieviren: SICHERHEIT- UND SPYWARE-NEUIGKEITEN (read October 6, 2026)
- Google Chrome Help: Use notifications to get alerts (no longer online) (read October 6, 2026)
- FTC: How to recognize, remove and avoid malware (read October 6, 2026)
- Microsoft Learn: Microsoft Defender Offline (read October 6, 2026)