Re: Vista Reboot cycle, BSOD
If this issue occurs after the first restart during Windows Setup or after Setup is complete, the computer might not have sufficient hard disk space to run Windows vista.
The computer BIOS might be incompatible with Windows XP, or it might have to be updated.
The video adapter drivers might be incompatible with Windows XP.
A device driver or a system service might be damaged.
If the issue is associated with the Win32k.sys file, it might be caused by a third-party remote control program.
Re: Vista Reboot cycle, BSOD
Vista has been installed on the computer about a year and a half ago. It's not an installation problem.
Re: Vista Reboot cycle, BSOD
Other likely issue is a failed video graphics card, cpu fan, or a failure on your hard drive. One of the first things I would try is booting to the hard drives one at a time. Then begin ruling out things by removing or disconnecting all that you can.
Ideally, you should disconnect everything but the cpu fan, power supply, one memory module, and video card. Then boot to a floppy drive (if you have one). Get as simple as possible, until it boots, then add one component at a time, rebooting after each additional thing. For memory, remove one module, then replace modules to see if you have a change in booting.
In my experience, a failed start up after a machine that worked well the night before, is caused either by memory or a hard drive.