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I would suggest searching on your video card manufacturer (nvidia) forums first off. They can help you much more than most game forums.

One of three things is the problem here, either your card is dying/dead, the monitor is dead/dying, or or your drivers don't work well with your older card. We can't really help with the first two, but for the third I would suggest revering back to earlier drivers. I don't know what they would be for nvidia cards, as I have only ATI cards at the time, but I am sure you can find the info on the nvidia site. For the monitor, you could try using an alternate monitor (a friend's monitor perhaps). If the game works fine, then your monitor is broken, if not, the problem likely is with the card. Check the nvidia forums and perhaps google for solutions, I'm sure someone has had a similar problem in the past.