Question : Windows XP computer keeps locking up

My computer is running Windows XP SP3 and keeping locking up/freeezes.  My only option is to manually reboot the computer.  When I look at the event log I see only these messages but can't figure out what is causing the problem.  I'm not even sure if they refer to the issue I am having.

Event Type:      Error
Event Source:      Userenv
Event Category:      None
Event ID:      1054
Date:            5/11/2010
Time:            4:25:05 PM
User:            NT AUTHORITY\SYSTEM
Computer:      HP-KIM
Description:
Windows cannot obtain the domain controller name for your computer network. (The specified domain either does not exist or could not be contacted. ). Group Policy processing aborted.

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


Event Type:      Error
Event Source:      AutoEnrollment
Event Category:      None
Event ID:      15
Date:            5/11/2010
Time:            4:25:06 PM
User:            N/A
Computer:      HP-KIM
Description:
Automatic certificate enrollment for local system failed to contact the active directory (0x8007054b).  The specified domain either does not exist or could not be contacted.
  Enrollment will not be performed.

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


Event Type:      Warning
Event Source:      EvntAgnt
Event Category:      None
Event ID:      1003
Date:            5/11/2010
Time:            4:25:06 PM
User:            N/A
Computer:      HP-KIM
Description:
TraceFileName parameter not located in registry; Default trace file used is .

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

Event Type:      Warning
Event Source:      EvntAgnt
Event Category:      None
Event ID:      1015
Date:            5/11/2010
Time:            4:25:06 PM
User:            N/A
Computer:      HP-KIM
Description:
TraceLevel parameter not located in registry; Default trace level used is 32.

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

Any ideas on what could be causing this?  

Answer : Windows XP computer keeps locking up

Are those errors occurring at the same time as the computer freezing?

The most common cause of a computer locking up are CPU thermal issues. Make sure it is not overheating?