I can log onto facebook

Question

my computer got a virus which i have now sorted but i cant log onto face book now it say incorrect email and password combination and i know im putting the right ones in so i tried to change parrword so they sent me a email with a link which took me to facebook but then the email address said it was invalid please help been trying to sort out for over 1 month with no joy why is there no phone number for face book its stupid