The XP CD won't launch Windows. You need to boot with the XP CD and push "R" when asked (load the repair Console) and run "Fixboot" if you have questions of what to do at that point, enter Fixboot /? and it will instruct you on the proper procedure.
How do you fix the error message "unmountable_Boot_volume"? I have tried to use MS XP cd to launch windows, but it won't launch either.