wmi peroformance slowdown

Have a user with almost brand new XP2 Toshiba laptop with Cntrno Duo 512 RAM
etc etc.

After windows update last week the machine botts slow and shutsdown real
slow and then everything seems slow in between-eg explorer shell lags like a
rabid dog.

I did step by step startups and managed to find that disabling WMI meant
that everything went back to normal pace but now, of course, my scripts won't
run.

I've found a hotfix on MS http://support.microsoft.com/?kbid=911262

I have patched using this but it does not seem to have helped.
Any other suggestions?