my son was using my Win 7 Alienware PC and now it has the fake fbi virus requesting money to unlock. I know I should be able to start in Safe mode and remove but the pc won't let me. I keep tapping F8 but it does nothing until i let it go. then it just boots to the lock screen. I also tried putting kapersky rescue disck 10 on usb but the pc isn't booting of usb. any suggestions?? Thanks, Eric