Installed windows 8. 1 every web browser I try locks pc up to the point I have to reboot even seeing a youtube video for mabe even 10 min it just freezes then I cant even move mouse or hit task bar motherboard is a sabertooth fx990 ram 4 gigs gpu is gtx 750 Ti 600 psu ...programs installed are asus suite for temp oncpu n fans ....try updating drivers still same problem...please help....