I am getting the following error in the event log over and
over again under Windows Server 2003, it generally seems
to happen every other day and clears up with a reboot,
only to come back again later on...:

Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1053
Date: 6/10/2004
Time: 12:40:46 PM
User: NT AUTHORITY\SYSTEM
Computer: QUEEN
Description:
Windows cannot determine the user or computer name. (Not
enough storage is available to complete this operation. ).
Group Policy processing aborted.

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Despite what the error says, there is plenty of actual
free space on the hard disk. What should be checked out?

Thanks in advance.