On initial thought, I would use DDU to uninstall your GPU driver and then install a fresh downloaded one. Access violation could also point to an anti virus software, but usually when it's complaining about graphics related jobs it's related to either the GPU itself or the driver for it. Those are two vectors to start troubleshooting.
I would highly lean to a GPU driver issue, though, especially with the black screen/PC reboot forcing (complete GPU failure will cause that, the black screen means Windows tried to reload the driver [that will happen on issues like that, it'll try to restart the driver, which you can do manually with a shortcut that I'm forgetting atm]).