Windows Defender review, free download

Type: Anti-Spyware

Windows Defender review

Windows Defender is a free anti-spyware program made by the leading software company to add native spyware protection to its most popular product - the Microsoft Windows operating system.

The final release of Windows Defender is the result of almost two years long testing and development started with the release of Microsoft AntiSpyware Beta 1 based on GIANT AntiSpyware, a popular spyware remover back in 2004. In the beginning of 2006, Windows Defender Beta 2 has been released. This version is very similar to the final product. However, the latter is definitely better and more solid.

We have tested the program on several different setups including badly infected machines and absolutely clean computers that were never infected with any viral parasites, spyware and malware threats. Tests revealed that Windows Defender is an effective, reliable and easy-to-use product that does not produce false positives and provides sufficient protection against most types of spyware, adware, browser hijackers and other malicious pests. However, it often fails detecting and eliminating widely spread viral threats like trojans, backdoors or worms. Moreover, Windows Defender is ineffective against emerging, new infections, although it uses heuristics.

Windows Defender’s installation is quick and easy, but only if you have a genuine copy of Windows, which doesn't have problems with the validation process and everything always goes smoothly. Otherwise, installing Windows Defender might be difficult and sometimes even impossible.

The program is launched as any other regular program. But usually you don't have to run it manually, as Windows Defender automatically loads on every Windows startup. Integrated real-time protection starts also.

Once the application is running you can start scanning your system. Windows Defender allows choosing between three scan modes: Quick Scan, Full Scan and Custom Scan. The first one enables an intelligent scan for parasites in common locations. Full Scan thoroughly examines the entire file system including not only system and application files, but also archives and suspicious objects not present in spyware definitions database. Custom Scan allows the user to select, which local hard drives to check. Each of three scans needs different time to complete. In our tests Quick Scan did not take more than three minutes, while Full Scan required almost an hour. During each of the scans Windows Defender checks all running processes, analyzes the Windows Registry and examines files and folders. The program scans all essential system components leaving no chances for most spyware parasites to hide.

Scan reports are informative. The spyware remover displays exact parasite location, associated files, related registry entries and threat description.

The program uses large spyware definitions database updated on a regular basis. The user can either update it manually, or turn on automatic updates. In our tests both functions worked as intended. However, a lot of users had or still experience problems updating the application.

Apart from common tools - Quarantined items and Allowed items - Windows Defender offers one additional utility - Software Explorer. This integrated tool provides details on startup programs, currently running applications, system networking components and software connected to the Internet.

One of the strongest sides of Windows Defender is its powerful and customizable real-time protection. However, it's definitely not the best one available on the market today. Popular anti-spyware programs like Spyware Doctor, Spy Sweeper or SUPERAntiSpyware outperform Windows Defender in this field.

Windows Defender has simple and user-friendly interface. The program has got almost the same look as its Beta 2 version had. However, the updated look is more convenient and thought-out.

The program's official web site is


Windows Defender is a decent anti-spyware program. It is free, powerful enough and yet very easy-to-use. However, it identifies and completely removes only regular spyware and adware parasites as well as some well-known, relatively old malware and viral threats. Unfortunately, Windows Defender does not provide reliable protection against widely spread trojans, worms and other malicious software. In other words, the program cleans most infections, but often cannot eliminate the cause, so the system gets re-infected. But if you have good antivirus program installed, then Windows Defender is just what you need.

Positive sides:

real time protection
free to use
deep file scan
complete system scan
Submit question about Windows Defender
Windows Defender spyware remover was carefully tested by research center. The review is the result of our test. If you know additional information about Windows Defender please send us the note.

Windows Defender screenshot

Information added: 2006-02-28 16:34
Information updated: 2014-06-11 22:38

Additional resources:

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Comments on Windows Defender

Big AL
Just discovered I have malware in my laptop - Defender cannot / did not find anything. Very amateur software packet for a company like Microsoft - I am dissappointed because I was expecting a far more "professional" product from Microsoft.......
Nicki Minaj
FEEBY FEEBY WHOS PEEBA BARSON TWO YEARS AGO I RENEWED MY LICENSE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -flips rat weave- im a barbie
i am desperatly trying to get rid of agv, and load windows defender. have tried all to get rid of it as it has errors that cant be fixed, it will not remove, and will not reload... i just want shut of it. i cant afford to pay for the removal tools that charge you. does anyone have any ideas how to do this. the thought of reformatting the pc just because of this is a nightmare! any advice greatly recieved! thanks
these "linux soldiers" never have heard about the worns... that become from UNIX systems... and a worn is a troyan... well..
oh shut up with ur dumb linux
I already have windows defender on my computer and security sheild wont let me open it as soon as I click on it Security Sheild shuts it down. Please help me....
Avoid all that virus/spyware/malware stuff - use linux.
The computer problems always drive me crazy, I want a program to solve my slow computer, several days ago my friend recommend me a software tuneup360, now I'm waiting for the result.
windows defender is a standard protection...
windows denfender does nothing against major defense kit.After full scan it says everything ok.
Plus that Super Anti spyware /SAS/ does nothing against major defense kit.
So is there any helpful review???????????????????????

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