If you are not getting a consistent driver file mentioned in the error, such as nv4_disp.dll, it is most likely a hardware issue.
If you can start in VGA mode (tap f8 promptly to access the boot menu), it is probably a video driver issue.
You should be able to boot from the CD if you enter the BIOS and ensure the CD-ROM is first in the boot order.
Faulty ram, overheating, a damaged or weak power supply are all possibilities.
Have you had the case apart and checked for dust build up and to see if the fan(s) are working?
Have you tested the ram?
Since almost all bugchecks can be caused by faulty ram, I would recommend you perform memory tests.
Beginners Guides: Diagnosing Bad Memory Windows Memory Diagnostic Memtest86 - A Stand-alone Memory Diagnostic
Further troubleshooting advice here:
http://support.microsoft.com/Default...314063&sd=RMVP