|It appears that your slipstreamed xp sp3 disk is a tailored CD which does NOT permit a repair option. This happens when a CD is created to perform a fully unattended install.|
It you look at the i386 directory on your CD you will notice a file call winnt.sif. This file is the answer file used to answer all the questions normally posed in an inter-active install.
In addition it will have an entry in that file (in the unattended section) that may look like:
To get round this and be able to a repair you will need to do the following:
1. Use an ISO creator/editor (like UltraISO or MagicISO neither are free) to create an ISO image of your CD.
2. Use the ISO editor to delete the WINNT.SIF from the ISO and save it.
Now you will be able to perform a repair.
Alternatively find and use a CD which is not designed for an unattended install.
Hope it helps.
☺ When everything else fails, read the instructions.