error43

Hello everyone, I am asking for some technical issue on behalf of a friend of mine. I've been trying to help as best I could, but I don't know anymore what to try! So my friend had been playing Anno 1800 for a while without a problem, but when starting up his pc this morning, he noticed...

Hi, I have strange problem with my msi gtx 970 4GB OC (white coloured fan cover) ; My GPU is not recognised propertly, when I install drivers it lock resolution on 800x600, device manager show error 43, and GPU-Z show that I have 0GB of RAM... please help me...maybe flashing will help, I dont...