Wow! 278 views and no suggestions? Hmmmm
Sorry we try to help as many people as possible but this is mainly a 'peer support' group so if no-one knows an answer they tend not to post.
It may be THIS however if you can't do much in regular mode, have you tried scanning in Safe Mode?
Tap F8 repeatedly while booting up, select that mode and then go to Computer (My Computer in XP) and right-click the hard drive and select "Scan".
All you'll see is a taskbar icon which will give a progress report when you hover over it.
That McAfee Labs link tells people to disable System restore before scanning - that's in case any of the restore partitions are infected which can easily happen.
There is some required reading here: https://community.mcafee.com/docs/DOC-1294
If that doesn't help try the following in "Safe Mode with Networking" (Safe Mode with Internet access)
Download, install and update and run the FREE version of THIS software.
Let it remove anything it finds and reboot immediately if asked to.
If all the above don't help then follow the Hijackthis instructions in THIS post.