Bootable cd

I have downloaded XP Pro which came down and is saved on my hard drive as an undisker ISO image. I want to be able to burn the program to a cd which I can then use to install the operating system to another pc. I have a copy of undisker, and also magicISO and I cannot figure out how to create the cd that I need.
What are the steps?

XP Pro is not freeware, please keep the forum warez free :cop: