i have several "self-perpetuating" files that i cannot stop by using ctl/alt/del (when i shut down one, another starts immediately...when i end that one, yet another starts running). names like "tuz6.exe", "Zjt7.exe" and "HieuD52.exe" when i search my C drive, they appear in a windows folder called "Prefetches" (which i am unfamilliar with), and nowhere else. does anyone recognize these files, or know what they are associated with? they are using a great deal of cpu memory when they run, and i can't get rid of them. thanks for any help.