BSOD in WMP11 with new 4830 install

My specs

Foxconn 780g MB
Phenom 9750
1x Sata 750g Samsung
1x Sata 300g Seagate
1x IDE 300g WD
1x Sata LG Burner
2x2gb OCZ Reaper 1066
Vista32
550w PS
3x CaseFans

I used the computer for about 2-3 months no problems. I was using the onboard HD3200 for video. I installed an Asus 4830 and then while watching video on WMP11 I get BSOD errors... mainly (Bad Caller Pool).
I was watching my temps CPU is running about 47c and Video Card is at 54-57c while watching a movie. I havnt had time to play many games, although when I ran Fallout3 on Ultra High settings I didn't experience any problems. Sometimes it will reset several times in an hour, other times it will let a video run for 12 hours (testing). It also when I ran a stress test for the card. I went ahead and removed the card and it just reset again while on video. I thought it may be the catalyst software, after uninstalling it all of the codecs are broken in WMP11 (reinstalling codecs doesnt work), but no problems in VLC or other players. I'm still testing it now, but figured I'd get a bargain on advice and ask here for any other solutions besides destroying it..buying better hardware .

(Also tried reinstalling vista) no change.

Any Ideas?

Thanks!

Did you install the video card drivers from ati's website?