If you haven't already nuked it, try this: You'll need a USB stick and another computer to do this. On the other computer, download and install the program here: ClamWin Portable | PortableApps.com - Portable software for USB drives This is a free and open source antivirus scanner that will run directly from your flash drive. (read: no registry entries are created, every part of the program will run from the flash drive.) Install the program to it, and then plug it in to your computer, making sure you do nothing with the autoplay. (no, don't even select "open with Windows Explorer to view files" since that may be affected by whatever malware you have, if any.) Run the program and let it do its thing, hopefully that'll solve whatever issue you have.