GTX 770 EVAC // Driver Problem

Hey, quite while ago (3months) I ran into problem with my card when I started noticing my games were running randomly on 1fps and discovered my GPUs have switched from External GPU to Internal GPU and what was reason? No clue, I belive it was maybe in the new update that came out 441.xx and I couldn´t deal with my pc problem straight cause I had to go to Army in few days.
Now coming back I have done full wipe on HDD and everything that could´ve been in way of lag then today I noticed Code 43 Error on Device Manager.

I´m not good on fixing GPUs yet, so any help would be appreciated !

Here`s what I`ve done so far:
Checked that everything is up to date.
GPU is nice and tightly fitted in its slot.
GPU doesn`t let me install any of the drivers.
 
If at all possible, it would be worth checking the graphics card in another PC - it's possible that it has died, leaving your machine to switch to the integrated GPU.
 
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