When I tried to upgrade my Nvidia drivers from 314.22 to 320.18 my pc crashed. When I followd an online guide to fix this problem, it told me to remove the drivers from "Device manenger", which turned out to be a bad idea. Because of that my driver installation seems to be locked: I can't install new ones (Windows crashes with a BSOD for SYSTEM_THREAD_EXEPTION_NOT_HANDLED or IRQL_NOT_LESS_OR_EQUAL) and I can't uninstall the old ones through "Programs and Features", which fixed my previous driver update problems. System recovery didn't help, nor did ccleaner or driver sweeper. I tried Memtest 86+, but it tells me there isn't a problem. I also tried to disable my Intel 4000 Graphics and uninstalling it's driver, but it also didn't help.
I also can't enter my Nvidia-configuration panel anymore.
All help is apreciated!
Motherboard: Gigabyte GA-Z77X-UD5H
CPU: Intel Core i5 3570K (stock speed)
Graphics: Msi GTX660 ti Power Edition OC
RAM: Corsair Vengeance LP 2x4GB DDR3-1600
Sound: Asus Xonar DG
Network: Asus PCE-N15
SSD: Crucial M4 128GB
HDD: 2x Western Digital Caviar Black 1TB in RAID1
PSU: Corsair GS800
Cooling: Corsair H100i
Other: LG DVD-burner (don't remember the type)
OS: Windows 8 64-bit