Display error 4109

Hi, im tired of finding nothing about this on the internet, and my game keeps crashing.

Game: wow-64 bit and 32 bit.

Error: display event id: 4109 (the program wow.exe is blocked from accessing graphics hardware) something along those lines.

game just freezes and blacks out to desktop.

before this occured, i had to install an earlier version of physx to fix a driver crash.
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