If all the files are on the CD...and the CD is not bootable...why not create a new, bootable CD and burn/copy the files to it?
Or am I missing something?http://www.google.com/search?hl=en&q=c...mp;aq=f&oq=
The technique will vary according to what burn program you use or prefer.
Or...you may use nLite to create a bootable CD, following the instructions there for creating an updated XP CD.
You have options
nLite - Deployment Tool for Unattended Windows - Guide - http://www.nliteos.com/guide/index.html
FWIW: If you have had malware problems...a repair install effort may correct some of the things now wrong with your system, it may not. You may ultimately have to do a clean install.