Hi Mark,
I also recommend you to perform a Clean Boot to narrow down the cause of
the problem.
1. Click Start->Run...->type msconfig and press Enter
2. Click Services tab and select Hide All Microsoft Services and Disable
All third party Services.
3. Click Startup tab and Disable All startup items
4. Click OK and choose Restart
5. After reboot, check whether the problem still occurs
6. If there are no more problems, please use the above steps to enable
services and startup items one by one in order to figure out the root cause
of this issue.
Refer to: 310353 - How to Perform a Clean Boot in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;310353
Since this is a performance issue, it may take some time to troubleshoot
the problem. If you have any update, let's get in touch.
Have a nice day!
Bill Peng
MCSE 2000, MCDBA
Microsoft Online Partner Support
Get Secure! -
www.microsoft.com/security
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