WotLK PC Freezes after playing a bit

[TheToucan]

Hello! I got issues with playing old expansions. I can login and I can play like 30 minutes - 1 hour (depends), after that my screen freezes and I need to force close my PC. Any ideas?
I already tried Large Address Aware.

[thyonem]

New PC. :s

[TheToucan]

I don't think my PC is the problem. It can handle legion and BFA without any crashes.

[Gleveen]

Far far ago have same problem with games and my notebook. Reinstalling OS helpes a lot in this cases. or just install another OS and try to boot it and run WOW with it.

[SabDK]

Try changing your graphic settings like Vertical Sync and stuff like that.