How do i resolve userenv 1054 and 1517 errors on a windows XP machine

I'm having a problem with a windoxs XP laptop on my network. it gets the below errors everytime it starts and shutsdown. I have also noticed that once I have that error other applications also hang like outlook for instance. How do i resolve this.

Event Type:      Error
Event Source:      Userenv
Event Category:      None
Event ID:      1054
Date:            09/02/2009
Time:            08:13:53 AM
User:            NT AUTHORITY\SYSTEM
Computer:      JOAN02
Description:
Windows cannot obtain the domain controller name for your computer network. (A socket operation was attempted to an unreachable host. ). Group Policy processing aborted.

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:      1517
Date:            06/02/2009
Time:            11:52:15 AM
User:            NT AUTHORITY\SYSTEM
Computer:      JOAN02
Description:
Windows saved user IDD\Joan 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.