Need help with bootcamp!

alright. here's the deal. Some crazy things are happening when i try to install windows xp sp2 on bootcamp. i have a bootable disk which works fine but when i boot the computer from that disk, i get lines across my screen to the point where i can barely see. i've heard no reference of htis happening before and i have no idea how to fix this or why it's happening. Can anyone shine some light on this??

an image of what's happening should be attached to this post

 

sorry. mac pro, dual 2.66 ghz, Radeo x1900 video card....and have a 24 inch samsung screen