online videos don't play

Hi,after malwarebytes (thank them!)unlocked my pc from reveton-fbi-ransomware virus no online videos will play!not in chrome,ie or firefox.espn,youtube,fox news etc.no sites w/video will play?i've uninstalled-reinstalled chrome,firefox & flashplayers doesn't help.i've searched the net w/the ? "why won't online videos play on my pc?"none of the advise has helped!anybody out there know what to do?Thanx in advance!

do animations on various websites play?

do you get any error message when you try to play an online video?