Gpu not working driver problems(I think)

Gracodana

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This is a bit long so skip to last 2 sentences for what problems I am having now


I have been having massive problems my gtx 770 started not working in games and so I reinstalled drivers. When I did this the computer said there was an error and wouldn't go any further I have reinstalled 3 different driver versions and many times of each. Then someone said I should update my MOBO bios this didn't work and they were definitly the right bios.
I then downloaded them in safe mode and this is the wierdest one, this worked sort of when I start up geforce exp I can't optimise games it says my gtx 770 isn't compatible but shadowplay and LED visualize showed up fine. When I tried to play games Skyrim ran at 25fps granted that there were a lot of mods (about 70) but it droped to about 5 at one point, Crysis 2 should handle at 60 fps and did on the 770 before the problems but now is 20-40 fps with watch dogs like stuttering, W_D ran at about 10 fps.

I have tried so many things if there is anything you could recommend I would be really grateful.
 

Gracodana

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windows is compleatly up to date
moniter is 227EALHA 1080p moniter 2ms response rate
asrock b85m pro 4 MOBO
8gb corsiar vengence ram
i5 4570
750gb WD scorpio black HDD
cx 600w corsair PSU