I really don't see why any system would need rebuilt over a virus or deletion of even a major system file........wipe it out and reformat. Even if bios is screwed up........pull the battery for a few minutes, and the bios will reset to default values again. The file sharing stuff won't put ---- icons on the desktop.....sounds like a download to me. If you know the name, or have a guess.......Start MenuProgramsAccessoriesSystem Toolsdisk cleanup, and then click the more options tab. Checked installed programs and see if you can tell which it is......good chance it is obvious. Then just delete it. Hopefully it's that simple, and if not, maybe someone else has an idea.