Situation: XP sp3 running NOD32 v4, latest updates. Also using Online Armor 5. In a folder within My Documents I noticed a .exe file that shouldn't be there. Tried to delete it, but got an "Error Deleting Folder or File" message: Access Denied. Make sure disk is not full...etc." So I used "Erase", and it was gone but replaced by another .exe. This time it was the calc.exe file. Erased again. (Checked my calculator, worked fine.) Now it is ping.exe. A new one just keeps showing up. Sometimes, they're .dll files. Now it's dmcompos.dll. Erased the folder, but the folder remains with a new file in it. Scanned with NOD32. Clean. Malwarebytes: clean. Any ideas?