Win2k pro reboots on startup

I don't know if anyone has a take on this.
Turned on my computer 2 days ago, win2k startup screen appears, the blue bar completes, and then chkdsk appears. It runs, reports no problems w/ windows files/folders, and then reboots!
This repeats ad nauseum. win2k starts up only in safe mode.
I checked for viruses and spyware. Nothing reported.
I ran emer disc repair. When it finished checking, computer reboots and reboots, and reboots.
Temp are ok in bios. 39c +/- 1-2c. No settings were changed.
IN normal startup, it will go to chkdsk, report no errors, and reboot.
I installed win2k Pro, sp4 about 2 months ago. Have had no problems since. I have not added any new programs recently. The last session experienced no lockups, & normal shutdown.
My system is: win2k-sp4 -fat32 file system
MSI K7N2 (6570) MB, Athlon XP 3200+, 1GB DD corsair memory (2-512mb sticks), cooler master variable speed cpu cooler, ATI 9700 Pro video w/128mb, onboard sound, 60gb 7200rpm maxtor HD, TDK 40x CD burner, LS-120 floppy, SBC DSL with online protection- anti-spy & anti-virus,
Any ideas on this weird rebooting? I don't want to have to go thru a reinstall if I can fix this.

Thanks All for your feedback.
The problem was my SBC DSL software was corrupted. Uninstalled it and the computer started right up. I'll reinstall it tomorrow.
The system log was the key. The error messages seem to point to network related issues.
There is a turn offf to the automatic boot, but it doesn't help.
I was about to reinstall win2k when I read your posts. Saved me a lot of hastle.
Thanks again.

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Balaji Venkataraman wrote:
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+Do those items point to something you installed or use? Aladdin?+
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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
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Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
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Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
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A dead logic-board battery in a Mac Pro can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.
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I've been encountering some weirdness over the past week or so...and I'd like to see if anyone else had experienced something similar (and maybe has a solution) or if this may be indicative of a bug of some sort.
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12-09-11 7:23:28.910 PM com.apple.kextcache: /System/Library/Caches/com.apple.kext.caches/Startup/kernelcache out of date.
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I have rebuilt the entire OS from scratch and this still occurs. I have also, in order to test alternative configurations, tried booting from a cloned backup. The only difference between the cloned backup and the internal drive of the MBP is that the internal drive is encrypted with FileVault and the clone isn't. The clone boots cleanly every time, from both a cold start and a restart.
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