AVG Anti-Virus Free Edition
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Full user review
"So far so good! ("custom" installation recommended)"
Lightweight and non-intrusive for my Windows Vista laptop. Can be custom-installed. Free!
None so far.
I reas some reviews before installing this software. Some users complained that it "highjacked" their browser (?), others that it changed their default internet search provider; it took too long to do a scan, etc. All of these issues can be avoided if you do a custom installation, and choose the features/settings you want. You can set it up so that it'll leave your default search engine alone, and also don't have it do automatic scans, but instead run them manually when its more convenient for you (I do scans once a week at the end of the day).
Some say that AVG "could not remove" their malware/viruses. Well, there is bad stuff out there that no anti-virus program can remove because they attach themselves to system files, so that deleting them renders your computer operating system useless, and all you have left to do is re-install Windows.