That happens to me when I put image settings to high performance in the driver settings.

Recently tryed that too T.T

wow, this is serious... do the multiplayer servers end up like that too?

It's caused by a bug in the graphics card driver.
changing the graphics card driver should fix this.
Maybe the older version would still work with the other games you're playing.

There's also a third option which is to use omega drivers.
These are not official drivers supplied by the graphics cards companies.

damn...
anyway, thanks a lot.

6150 is of the cheapest end of 6 series. Such is to be expected. The geforces below -600 aren't really ment for gaming, in personal opinion and experience. They're placeholders for those who do not do gaming, but still need 3D card to run graphical UI :P

Nice explanation, Foxie.