I'm sure you've probably stumbled upon a page while surfing on your firefox or ie that looks like this: And if you haven't, you clearly don't surf the web much. In the best case, you can just easily close the window and the fake scanning disappears. There is one out there which, once stumbled upon, will install itself automatically and corrupt your boot files. Windows Startup Repair will no help. This threat is real, and I advise you to backup all your files at once. This past week alone I have repaired 3 PC's with this issue, all having been formatted just to restore the boot files. I'm trying to look for an easier solution than to just format and any suggestions would be appreciated. If you were hit and are lucky enough to still boot up just like I was able to, download ComboFix which will easily remove the threat.