Hmm, well I had one prob with SP3 this weekend. I got handed a PC with a broken HD someone wanted me to recover files from and possibly recover the HD too. it was a DELL with a bunch of intel components and radeon X300. Anyway, I thought I'd install SP3 straight after the XP+SP1 dvd.
After that Auto updates stopped working, so I uninstalled it, installed the 90 or so fixes and updates since SP1 and then reinstalled SP3. Windows update worked fine after and updated windows and Office as expected.
Must have been some required dependency it needed, got a feeling it was pne of the interim windows update update utils that checks WGA was skipped and messed the whole thing up.
After that Auto updates stopped working, so I uninstalled it, installed the 90 or so fixes and updates since SP1 and then reinstalled SP3. Windows update worked fine after and updated windows and Office as expected.
Must have been some required dependency it needed, got a feeling it was pne of the interim windows update update utils that checks WGA was skipped and messed the whole thing up.