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
Computer: QUEEN
Windows cannot determine the user or computer name. (Not
enough storage is available to complete this operation. ).
Group Policy processing aborted.

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

Thanks in advance.