Event ID 1055 on XP Pro, but not on SBS 2003 DC

I have an XP Pro workstation getting the following error for 1 user account. When he uses his Vista notebook, it doesn’t get the error. The SBS 2003 server doen’t show an error when the XP workstaion createa the error. I have disconnected and reconnected to the domain. I’ve uninstalled and reinstalled the Windows Network client. Flushed DNS. I am at a loss.
I am hoping someone can give me a solution.

Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1055
Date: 3/19/2008
Time: 2:34:15 PM
User: COMPANY\user
Computer: PAT
Description:
Windows cannot determine the computer name. (Access is denied. ). Group Policy processing aborted.

Cheers!
Stevens