Display corruption

In case you haven't heard, I upgraded my desktop machine to an Intel Core 2 Quad processor, 4GB RAM and an 8800GTS video card. A couple of 500GB HDD running RAID 0 and an SLI capable motherboard round out the system.

Problem is, even with all of that pretty hardware, I consistently get display corruption issues when playing DVD, DivX or XviD videos via Windows Media Player or DivX Player. Shortly after the display corruption appears, the system will freeze.

I've reinstalled the OS, drivers, codecs, but all to no avail. I'm fairly certain now that it is a bad codec interaction of some sort. I'm certain of this because I've tried playing the same videos with VLC Media Player which uses its own codecs and doesn't use system ones. Games play fine. Normal application use is fine. So...

The system remains cool to the touch, so it's not overheating. In fact, it runs much, much cooler than the previous one at only 2.5Ghz vs 3.4Ghz. Of course this bad boy helps.

So if anyone has any suggestions...