boring computer virus question

so my hard-drive seems to be infected with what my virus scan calls "generic downloader.ab" or something, but it is in quite alot of files, I'm sort of unsure whether I can just delete them all as they appear in virus scan or not, like, are they important files, they're mostly c:/system volume information/_restore followed by a huge series of numbers and letters. failing a big deletion how do I get rid of this virus, which admittedly mcafee says is not very serious (I think it might be just making some pop ups happen, cos when I use ad aware they still are coming up). the instructions on mcafee's site which I normally use for getting rid of viruses are pretty vague in this case.

any help would be greatly appreciated.