Win2k server restarting randomly, with no blue screen, could it be caused by chkdsk?

I am running a Windows Server 2000 Small Business for a client. Starting at the end of last week it began restarting unexpectedly. I disabled Auto-reboot on blue screen to see if the client sees a blue screen. They have not reported seeing one yet. Also this computer is several hours away and I cannot easily just look at it. I had problems originally with corrupt event logs but I seem to have fixed that. So the only event log data I can go off of is the last time it happened. Here is the last entry in the application event log before the server went down.

Event Type:      Information
Event Source:      Winlogon
Event Category:      None
Event ID:      1001
Date:            2/4/2008
Time:            12:09:22 PM
User:            N/A
Computer:      NLCAMBRIDGE
Checking file system on C:
The type of the file system is NTFS.
Volume label is Win2k.

A disk check has been scheduled.
Windows will now check the disk.                        
Cleaning up minor inconsistencies on the drive.
Cleaning up 98 unused index entries from index $SII of file 0x9.
Cleaning up 98 unused index entries from index $SDH of file 0x9.
Cleaning up 98 unused security descriptors.
CHKDSK is verifying Usn Journal...
Usn Journal verification completed.
CHKDSK is verifying file data (stage 4 of 5)...
File data verification completed.
CHKDSK is verifying free space (stage 5 of 5)...
Free space verification is complete.

  12586927 KB total disk space.
   7860764 KB in 56220 files.
     18192 KB in 2320 indexes.
         0 KB in bad sectors.
    673094 KB in use by the system.
     64992 KB occupied by the log file.
   4034877 KB available on disk.

       512 bytes in each allocation unit.
  25173854 total allocation units on disk.
   8069754 allocation units available on disk.

Windows has finished checking your disk.
Please wait while your computer restarts.
I have looked through the scheduled tasks but there is nothing in there set to run this program. Why else would check disk run on a server in the middle of the day when it is not scheduled to? Also the next even states that the reason for the last reboot was unknown. I was actually in with VNC when this happened and it told me the server was going down, but then it states it doesn't know why it restarted. I have searched on google for hours, but everythig there is chkdsk running on boot, this was it starting after the server had been up for over 10 hours.
Any help would be greatly appreciated.
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If yo uwish you can try the below. I have used this myself and it stopped the server from CHKDSK when I rebooted it remotely. That way I could do it when I was ready. May be worth a shot....even though it is chkdsk'in whilst being on.

Disabling Chkdsk - Windows 2000 and XP
1. Run the Registry Editor (regedt32.exe)
2. Under the HKEY_LOCAL_MACHINE subtree, go to the following subkey: \SYSTEM\CurrentControlSet\Control\Session Manager
3. Change the BootExecute entry to: autocheck autochk *

Exit your registry, you may need to restart or log out of Windows for the change to take effect.
special_joelAuthor Commented:
Thanks for the help, the problem eventually seemed to fix its self after two days and it hasn't restarted since.

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