Uninstalling ubuntu

i have a compaq presario laptop,
i've installed ubuntu 10.04 on, now i want to install windows xp on it,
but i was unable to install xp on it, currently i have only ubuntu installed on it.
i want to uninstall ubuntu and install xp,
can u please tell me how to uninstall ubuntu from it?
thank you,

Uninstalling

If you know how to boot your computer from CD put the windows disk in the tray and boot the windows CD. After the windows start up finishes installing files and such follow the on screen instructions and you will see the option to install windows. You want to delete all partitions. After they are deleted create a new partition and reformat it. then follow the on screen instructions.