Windows 2000 continually reboots

[pcwiz]

As soon as Windows boots completely, it shuts itself down and reboots, over and over. Safe mode works, though, and I scanned it with Norton Antivirus 2004, but no viruses were found. Anyone have any suggestions?

[malcore]

You do not receive any error messages? To further troubleshoot and hopefully receive an error message instead of a reboot, right click My Computer, go to the Adavanced tab > Startup and Recovery and uncheck Automatically Reboot on system failure.

If you do get a BSOD with an error message instead of a reboot, post that information here. Assuming you have all critical Windows updates and service packs and excluding any infection, it may be buggy drivers.

[ski]

Troubleshoot with a clean boot:
http://support.microsoft.com/default.aspx?scid=kb;en-us;281770

[pcwiz]

I unchecked "automatically reboot" and tried booting normally. No BSOD or error message appeared, just a blank white screen. But, when I booted in VGA mode, I got a BSOD with this error message:

*** STOP: 0x00000050 (0x80562F40,0x00000000,0xFC991971,0x00000000)
PAGE_FAULT_IN_NONPAGED_AREA
*** Address 80562F40 base at 80400000, DateStamp 40d1d183 - ntoskrnl.exe
*** Address FC991971 base at FC991000, DateStamp 408d4b3d - vidstub.sys

Beginning dump of physical memory
Physical memory dump complete. Contact your system administrator or technical support group.

Does this help?

[malcore]

Could be failing memory. Try testing your memory with memtest86 (http://www.memtest86.com/).

Have you added any new hardware or software prior to this problem? Anything that you did that corresponds with the time that the problem started, updated software, drivers, etc?

Also check Ski's link. Troubleshooting with a clean boot is a good way to go if your memory passes tests.

[pcwiz]

The clean boot worked- the problem was some faulty software that loaded at startup.
Thanks everyone for all your help.

[ski]

You're welcome.
Nice to know that you fixed the problem, and thanks for posting back with the solution.