If this is solved I will gladly award 500 points! This has been an ongoing issue for the better part of a year. I will go ahead and explain the problem, then give a complete system build and attach the minidump file.
I have been running a system for about 10 months now and get consistent BSOD errors. They occur about every 24 hours and at best once a week. The BSOD seems to indicate that the graphics driver is at fault. I have updated all system drivers to the most up to date versions as well as rolling them back to 4-5 different stable old versions in the hopes that one of them would fix the error.
In frustration, after about 6 months of working with this problem, I purchased a second video card, the first being an ATI 5770, second being an Nvidia 260 GTX. The problem 'seemed' to be fixed, but then remanifested itself in a very similar fashion after a short period of time. The ATI 5770 would crash upon opening World of Warcraft (intro screen has some sort of video which would hardlock the computer). With the Nvidia card, it doesn't lock on the login screen but will cause severe graphics corruption randomly in game. Furthermore, the system will crash when playing streaming video online (it hates youtube).
This problem seems to compound when the system has been up for greater than 24 hours. I have made it a habit that if I am gone for the weekend, to make sure to reboot my system after returning, otherwise it will hard lock on the first video it trys to run.
I am down to thinking there is a hardware problem with the motherboard or possibly a problem with memory. I have run memtest but it has been 6 months, no errors were found. Another thing worth mentioning: I built a very similar system for a friend of the family and they have the same issue with BSOD. They are running Windows 7, whereas I am running XP.
Gigabyte MA790GPT-UD3H Mobo
AMD Phenom II 955 Black Edition
4gb G.SKILL DDR3-1333 CL 8-8-8-21 1.5v
PNY Nvidia 260 GTX XLR8 Performance Edition
--alternately XFX ATI 5770
WD 160 GB 10k Raptor HDD
ThermalTake Toughpower XT 750w PSU
Coolermaster case (huge amount of ventilation, heat isn't an issue)
Zalman 9900nt CPU cooler
Samsung dvd-rw (not sure on model)
Let me know if there is any other information you might need. I've also attached the minidump file from the latest BSOD.