Try to boot your computer to safe mode (restart the computer then press F8 key then choose "safe mode" when the startup menu appears.
Scan the system using McAfee virusscan in safe mode.
Let us know how it goes.
recently a 'friend' of mine brought with him a virus in a pen drive. i knew that it contained a virus so i at first checked it with my one-month old upgraded mcafee antivirus; and found lots of virus' which of course was deleted. but after sometimes when i restarted the computer the computer just hanged at the desktop. i at first thought that it could be a trojan which messed up the registry, and made a few repairs through booting from my windows xp cd.then the computer started normally but my mcafee antivirus didn't open at all. the window opened but closed automatically. so i opened my ad aware lavasoft anti spyware software and runned a check on the computer and it found two registy changes and repaired it but still the antivirus was not opening. furthermore whenever i try to open the mcafee folder the computer hangs up and then restores itself, also, after creating a new folder i renamed it mcafee and the same happened with it as the original folder.
out of frustration, i restarted the computer and shockingly i was kicked back to square one. where the computer just hangs. whats the solution to this problem, which i guess is a virus. i'm writing this mail from another computer as mine is totally inaccessable. my operating system is windows xp pro service pack 2, and its a fast computer at 1.7ghz