Clean up infected computer from viruses

Posted by ripper234 on Super User See other posts from Super User or by ripper234
Published on 2009-08-17T09:14:15Z Indexed on 2010/03/18 14:11 UTC
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I have a computer which had AVG Free installed from day one. After several months of operation, it starts detecting viruses and trojans all the time.

Besides running a full scan, what should I do to clean the computer? Should I install another anti-virus or anti-malware tool (can it help?), or once viruses infect a system the only real solution is a clean format?

(Lately I've heard of viruses that burn themselves in the BIOS, so a clean format might not always work ... how common is this technique? Should I burn a fresh BIOS as well?)

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