Question : DC keeps rebooting- 2003 server!

Hi my Primary DC server keeps rebooting and I get the error that lsass.exe is rebooting the machine? help! I look in the event logs and I see that it has this error

The process winlogon.exe has initiated the restart of computer Server on behalf of user  for the following reason: No title for this reason could be found
 Reason Code: 0x50006
 Shutdown Type: restart
 Comment: The system process 'C:\WINDOWS\system32\lsass.exe' terminated unexpectedly with status code -1073741819.  The system will now shut down and restart.

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This is the event log right before the restart but it might be because of the restart and not the cause.

Event Type:      Warning
Event Source:      W32Time
Event Category:      None
Event ID:      22
Date:            5/18/2010
Time:            10:24:06 AM
User:            N/A
Computer:      IEPSZW001
The time provider NtpServer encountered an error while digitally signing the  NTP response for peer  NtpServer cannot provide secure (signed) time to the client and will ignore the request. The error was: The RPC server is unavailable. (0x800706BA)

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Thanks for any help I can get. Also I ran a full Norton Antivirus scan and found nothing.

Answer : DC keeps rebooting- 2003 server!

Try installing below hotfix,if it applies & also try to uninstall symantec which might be corrupt.
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