delta.dll is a dangerous file that should be avoided. Just like deltaApp.dll, deltasrv.exe and deltaEng.dll, it belongs to a seriously suspicious search engine that is called delta-homes.com. As you can clearly see from pictures that are given in its description, delta homes virus seeks to trick people into believing that they need to check their Registry for errors, repair Windows errors, download software updates, etc. Before you click on any of these ads, you should know that they are misleading and are used for spreading only questionable applications that, instead of helping you, can lead you to various PC-related problems.
Also, after taking over your start page and/or the default search engine, delta homes can start showing you altered search results. This is done for a very simple reason – trying to redirect you to its affiliate websites and help them to increase their page rank or sales. That's how delta homes owners make the money. However, there is no guarantee that these sponsored search results will not redirect you to unknown and even suspicious websites that belong to malicious third parties. Finally, such hijackers are capable of tracking PC users and collecting personally non-identifiable information.
What delta.dll is usually used for? Just like any other .dll file, it works as a Browser Helper Object (BHO) that runs automatically each time when computer is rebooted. It seeks to monitor the browser and collect information about victim's activity on the web. You should be capable of finding this file in “C:\Program Files” subfolder but sometimes it may fail to appear there. That's because it actively seeks to avoid its removal from the system.
Please, do NOT let delta.dll stay on your machine because, as we have already warned you, it is a malicious file. For checking its trustworthiness and getting ability to remove delta homes and related files, you should use these programs: Reimage, SpyHunter 5Combo Cleaner, Malwarebytes.