You will need to run your virus scan/clean in safe mode. Restart your computer, and hit the F8 key repeatedly while it's booting up until you get the selection screen to boot in safe mode. Once there, click the Mcafee and run a full system scan again and clean anything it finds. Once it's finished, reboot normally.
It would be a good idea to visit
http://housecall.trendmicro.com/ and have it scan your puter as well.