My current setup is the following:

A-DATA 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
SAMSUNG 20X DVD±R DVD Burner Black SATA
ASUS EN7300GT SILENT/HTD/256M GeForce 7300GT 256MB 128-bit GDDR2
ASUS P5W DH DELUXE/WIFI-AP LGA 775 Intel 975X
INTEL E4300 CORE2DUO
THERMALTEK 430W POWERSUPPLY
etc etc

I have been running REMBER (Memory tester) and CPUTest (Pegs CPU cycles) for a couple hours and my computer hasn't errored at all.

But when I view a video, in either quicktime or VLC, I get the grey screen that says "please hit the reset button" in like 3 languages over and over....

I have tried a DIGG podcast on iTunes and an xvid of a movie on VLC. Both crash my computer within 10 minutes.

I am running the default setup of the kalyway 10.5.1 setup DVD, along with iTunes 7.6.1, and I followed the bios instructions on lifehacker that is floating around ($800 hackintosh).

My video card is the 7300GT, it has passive cooling (No fan) , my case temp isn't anything to speak of, and obviously I am not OC'ing the video card, so I can't figure out why this would be crashing. I wanted a pretty silent PC, no major overclocked is involved, my ram is at 867 at 1.9V and my C2D is at 2.6ghz at 1.4375V. Both run stable at this speed.

What could be going on. Are their any new drivers out?
Thanks a bunch,
Mario