Well first of all, what happens when you try to boot from the Windows XP cd? Saying "it don't work" doesn't help us out very much. The first thing that you should do is make sure that you boot order is set correctly in the BIOS. If you have multiple optical drives try booting from another one. Lastly, make sure that your copy of windows xp is actually bootable. Sometimes burned copies can do weird things.
It's crazy I'm thinking, just knowing that the world is round.
-http://www.techwarepc.com/ - The Technology Experts