Chris S...
I hate that Error code: oxc0000005
I had that error for a few years from video problems which I troubleshooted down to either CPU overheating ( extensive graphics) video data bandwidth from AGP over Motherboard causing the problem. AMD setup, ASUS A7N8X M.B., ATI Radeon 9600. Reading about problems with that specific hardware, I found that since ASUS sent the product to china to build a problem with my M.B. had to do with Circuit board traces for AGP were weak and causing crashing.
I slowed that particular crash when updated to a ATI 9800 video card because it was a more powerful card lessening the load from the rest of the PC. one main reason for the large load is lotsa video data on a large resolution (1920x1200), turning that down reduced the problem more.
Damn EQ running 24 hours a day wasn't all good for hardware
sad, Ill never know if its the M.B. or the CPU now... next PC will replace both