I have these blocks all over my screen mainly white and sometimes they flicker blue and pink. I had to reinstall windows due to an undoing changes error which kept occurring and everything was fine then I reinstalled my driver for my graphics card the gtx 970 on windows 8.1 64 bit and this error occurred. Not sure what to do and I'm not sure if my graph is driver even fully installed. When I try to re run the driver installation it encounters an error, what do I do ?