For re-installig your drivers, just download the latest for your card.
You'll want to do a "Custom" installation, and check the box, "Perform a Clean Installation"
For now,however, download Malwarebytes and install it. Malwarebytes : Free anti-malware, anti-virus and spyware removal download
(Free Version is fine)
Reboot in safemode (F8 during bootup) and run Malwarebytes. (Make sure you update it too first)
The sfc scan would be a good idea afterward. Once in Windows again, press the start orb and in the search box type: CMD
In the first result, which should be a cmd.exe, right click it and run as Admin.
Then, in the command window that pops up, type:
You want to run this scan as many times as it takes until it says No Problems found.