Install the latest drivers from www.geforce.com and restart if asked.
Now if windows asks to repair again choose not to, its removing the drivers you just installed.
Start windows normally and hopefully everything will be back to normal.
yeh but if i choose not to repair then il see black screen again, and if i restrore then not. i did it like 10 times. And if i restrored system then i evrything was normal but then i didnt have drivers anymore.