does it give you any error mesages?
it's best if it gives you the name of any file that is causing a problem
some programs install their own drivers for CD/DVD drives, so when you uninstalled the burning program, it deleted the driver for your CD/DVD drives.
you can try putting the XP disk in and doing a repair-install
put it in on boot, make sure it boots from CD, and then when setup loads press enter. go through until it says "looking for previous versions of Microsoft Windows" and then press 'r' at the next screen