Try in run command "sfc /scannow" without the quotes and have your CD in the drive. It may work to restore your missing or corrupted files
augie
<edit> If you will reformat partition your drive thus 5 to 10 GB for XP(I have 10) and the rest as youlike. Load your apps and install to your D drive.
Take an image when you like your setup on CD-RW.
Here's a good tutorial on how to do it.