This info found on a technology report site..
"Regarding Boot errors.. Microsoft advises AMD Users to remove SP2 altogether. AMD also recommends that people affected by the problem do so."
This regarding a "freeze on bootup" error that apears to be linked to something called a DEP handler that is used by AMD processors.
Since installing SP2 my computer has been 'freezing' on bootup and I had to boot in safe mode then reboot in order to get my computer up and running.
I just thought I'd share this info with you good people. In case you find yourself with similar problems.
Cheers!
...
David takes a deep breath and dives into the world of reformating and reinstalling winXP.. He'll be back, count on it.