i have all of a sudden gotten a virus on my computer.. i have a windows xp and in the past i could just use the F8 function as its starting up and it would bring me to the restore screen. but that doesnt come up any more.. i have tried to go to accessories and system restore from there but i got a message that said application cannot be executed, file is infected. and i have used the control pannel way as well but same result.. any ideas?