I had that problem about 2 years ago and I can't remember the solution. All I know is that I just extracted a bunch of files in WinRAR and I deleted them, after a reboot they were still there but they brought friends along (5-15 copies of themselves) and my desktop was filled..they went of the screen!)
It took me a couple reboots but I forgot the solution...try to look on Google and I'll see if I can remember...