Computer freezes on switching between limited user sessions

I am running winXP SP2. I have a problem that only seems to happen if we
have 2 limited user accounts open at the same time. One of the session
freezes on log off and then you have to force a reboot. Any idea what
causes this please. Here is a copy of the application log warning that is
left at the time:-

Event Type: Warning
Event Source: Userenv
Event Category: None
Event ID: 1517
Date: 16/03/2008
Time: 14:54:16
User: NT AUTHORITY\SYSTEM
Computer: STUDY1
Description:
Windows saved user STUDY1\Pamela registry while an application or service
was still using the registry during log off. The memory used by the user's
registry has not been freed. The registry will be unloaded when it is no
longer in use.

This is often caused by services running as a user account, try configuring
the services to run in either the LocalService or NetworkService account.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

Event Type: Warning
Event Source: Userenv
Event Category: None
Event ID: 1524
Date: 16/03/2008
Time: 14:54:15
User: STUDY1\Pamela
Computer: STUDY1
Description:
Windows cannot unload your classes registry file - it is still in use by
other applications or services. The file will be unloaded when it is no
longer in use.



For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

On this occasion the user Pamela attempted to shut the computer down and got
the warning that there were other users logged on. So Pamela then attempted
to log off and it was then the computer froze giving rise to the errors
above.

Event Type: Information
Event Source: Application Popup
Event Category: None
Event ID: 26
Date: 16/03/2008
Time: 14:53:42
User: N/A
Computer: STUDY1
Description:
Application popup: Windows : Other people are logged on to this computer.
Shutting down Windows might cause them to lose data.

Do you want to continue shutting down?

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.


.

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