cannot boot into safe mode toshiba satellite L355 S7831 vista home premium. F8 DOES NOT WORK? After "Tosiba# screen appears, I just get a blank screen with blinking cursor. My virus software recently moved virus trovvjan horse 32 to the virus vault. Need to repair OS. Having runtime errors and a host of other problems. I miss the old ms dos days where you could at least work from c prompt. I am afraid my hard drive is infected. I wish I could debug or something!!! HELP? Tried others' suggestions but nothing working.