yes, that nail is a nasty one. i advise that you have protective software running on your computer in the future, and that you use it on a reasonable basis. i advise you install avg free edition (free.grisoft.com) and lavasoft ad-aware se personal. update both, reboot in safe mode (logging on as administrator) and run a system scan in avg free. reboot in safe mode again, run a full scan in ad-aware se. delete all objects listed as critical objects. then you can reboot and follow howard's advice. the reason for this is that viruses and other malwares will undo you attempts to clean the system unless you run said apps to remove the bulk of it all before cleaning up the hard-to-get stuff.