Can someone tell me why all the sudden I have many evenly spaced vertical lines on my...

...laptop screen? I have an Alienware M550i with a nVidia 7600 go graphics card. I try to install the correct driver for the card but every time I restart to apply changes I get the BSOD. The last time i restarted I logged on and all of the sudden I have evenly spaced vertical lines all across my screen. I just have the Standard VGA graphics adapter installed now. Any help would be greatly appreciated.
 
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