what should I do to remove this n make my pc as it was bfore

[Om_A]

I got this error n I want my pc to become like the firstA it was so plzz help me out

 

[basroil]

If you don't mind losing all your data (unless you back it up first, always a good idea to have an external backup), follow the instructions at http://windows.microsoft.com/en-us/windows-8/create-reset-refresh-media to reinstall Windows entirely. If the issue was a virus or bad driver though, reinstalling is only a temporary fix.