1
Completely remove the current graphics card device driver using the widely available free DDU utility, then restart your PC and go to the support page for your PC on the manufacturer's website to download and install their recommended version of the graphics card device driver.
A slightly older version of that driver is more stable than the latest version.
2
If that does not solve the problem, because oyu have re-installed Windows and the problem continued, the best option is to download the widely available free utility MemTest86, then run a full 4 pass scan with that to test your RAM for physical errors