How do i fix my screen?

How can I fix my graphics card after installing wrong drivers(blank screen)?

• Ok, recently I was trying to play a game, but the screen flickered when I tried to play that specific game, so I checked the name of the graphics card in my computer in the Device Manager and downloaded and installed a driver. My graphics card is: MSI NX7800 Series but there are 2 of them in the computer, and they're connected by a thin black "bridge" of some sort(pardon my ignorance). So, during the installation of the driver a yellow balloon type thing popped up in the lower-right corner saying something about SLI. I ignored the balloon and installed the driver. After that the screen went black, I tried restarting and it was still black. I then tried removing the graphics cards and connecting the screen to the on-board motherboard card, turned on the computer and got an image on the screen. I tried to find some way to install the driver and when I failed in that I tried System Restoring to 3 days earlier, the shutting down, re-installing the graphics cards, connecting the screen to them, turning on and then I still got a black screen. I believe I installed a wrong driver or perhaps even a virus. Even if I connect the screen to the motherboard the screen is black, as long as the graphics cards are installed. How can I fix this? PLEASE help me! :(

• Answer:

  I assume you are using Windows. You need to enter safe mode; http://www.computerhope.com/issues/chsafe.htm Check out that site for how to enter safe mode. Once there, you should be able to load windows without it using any non-generic graphics drivers. Then, you should reinstall a good driver.