I don't think it's been asked, but if you have Win XP, even if you delete the virus, it'll be saved in Sys Restore, one of the joys of XP. Turn off System Restore and run your AV again and that should get rid of it once and for all.

I learned that from someone else when I had a virus on this computer, removed it, and it kept returning. I was told to do the above and it worked.