I downloaded combofix, and hijackthis onto my computer however, once they opened them to launch program they would show the log but then, magically disappear.

I copied Combofix and Hijackthis onto a flash drive; can I run it from there; and should that work?

I am desperate to get rid of this PC Antivirus Protection 2010 and Antivirus Pro madness that has taken over my machine!

Thanks