GG, I used the auto install routine. Although I got a file not installed message the only file I could find not installed was Framework 1.1. The system now reports XP SP3.
I found a 'strange' icon in my Control Panel, something to do with notecards, I didn't note the name or check it out. I also found two new folders in the Programs folder. Both empty and I have no recollection or recognition of them.
I will need to browse my backups pre-sp3 to see if they were there before the upgrade.