I updated the video driver and now the screen won't come on? how can I roll back the driver when I can't see the screen?

I am running my Mac Book Pro with Bootcamp. Leopard on one partition and Windows 7 on the other. I updated the driver for the Nvidia video card then the screen went black. I tried to boot into the MAC side but the screen doesn't even show the optional boot screen. It does however sound like it's booting, I have tried hooking up a second monitor to see if it would show on that but it doesn't. I have also tried booting from the CD using the Win 7 disk, hoping that it would use the video driver on the disk instead. I'm either not doing it right (pressing ctrl & D whilst starting up) or that doesn't work either? I'm a bit lost? Don't know how to get to it.

Take your MBP to an Apple Store or an AASP.  If you are still under warranty and/or have AppleCare, suggest that you take advantage of it & call Apple tech support. 

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