"Disco" like graphics problem

Hello. I have this problem on one of my PCs that I run SL on....basically I can play fine but at certain places in certan camera angles the surroundings that I see completely mess up and start to display rainbow like graphics, if I move the camera slightly it goes back to normal, but if I move again in another angle, the graphics revert to this odd disco like color effect..

What can the problem be, how can I fix it? I thought it may be my graphics card is old or such, but I have another PC I run SL on and the card on that machine is MUCH older, and SL runs just fine!

The most commonly quoted solution is to turn off VBO in preferences. There are so many versions of the client I'm not sure where it is any longer, but somewhere in the graphics/advanced graphics tabs.

Also sometimes suggested that it's a sign of a graphics card starting to fail.

Worked great! thanks allot ^^