flashing diagonal lines during game play

[spikesjack]

Can anyone help me please, whenever I play games on my pc I get fast moving, flashing coloured lines coming from the centre of my screen and after a few seconds my computer freezes and I have to turn it off and re boot. Everything else works fine, word, photoshop, internet browsing, etc, its just when I game. I've run the diagram tests and they all say no problems. I tried to update my drivers but everytime I do, the installation gets 3 quarters of the way through and fails with no explanation! My graphics card is nvidia geforce 600 series and my computer is xp. If anyone can help I'll be so grateful, its driving me mad! Thanks in advance

[Murf]

See no one came by;

I believe it is your graphics driver. nvidia geforce 600 > do you by chance know the model of the graphics card?