Than an issue with Care One.
Remember that SP3 for XP is very new and should be considered as a Beta at the moment. As it's so new all the problems have yet to be found and rectified. The only saving grace with this Service Pack is it doesn't break as much as the previous Service Packs Broke. Which is a double edged sword. If it broke a lot of things then End Users would accept that there needed to be work done with the SP but as it breaks so little End Users install it expecting it to work and not break anything.
The possible combinations of Software and Hardware are so vast that things should be expected to get broken. But having said that I don't use this product as I don't think it works well enough for my needs so I have not personally experienced this Issue. But then again I'm not deploying SP3 either I just have it on a few test rigs.
I'll let others install it find the problems and then wait with nonworking things while M$ tries to fix the problems that they introduced with the SP. Just this week I had a Toshiba refuse to allow SP3 to be installed. In the end it was the same problem as HP is experiencing with their AMD Computers except this was a Toshiba not a HP and it has a Intel CPU not an AMD one. :D
Life is so interesting isn't it?
Col