What section of your computer shows up with these files?
They must be in some folder or something!
Have you tried emptying your trash can and see if that makes some difference.
Try some of the free software that offered and written about in these forums like CC Cleaner. etc...Otherwise I can only suggest that you open your registry editor and do a search in there for the location of these files. Start with HKey_Local_Machine open up the edit tab and then try find in that section and then carry on from there.