This is probably not the case, but the 4790K should have an integrated Intel HD4600 video adapter, so could it be that this is enabled instead of your 970? You can be sure if you enter the BIOS (check your motherboard's manual on how to enter during boot - Usually it's either "Delete" or function buttons "F1" or "F2" before Windows startup), then under intergrated peripherals (or similar) leave the IGP as disabled / or enable dgpu instead of igpu.
It seems strange that you get an error message when trying to enter the Nvidia controlpanel, assuming it is the Nvidia controlpanel you get an error for? Do you get a code with it aswell? Something is definitely not right with your software because you should be able to enter it no problem.
The error dont have any numbers, only words, in my case words in Hebrew.





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