Insert your xp cd,make bios boot from cd(F2,F8 etc.) and format HD completly when asked.
Don`t you want to keep Ubuntu? Ubuntu 7.10 will do all the work for you(about installation),if you want that after you install xp,just insert your Ubuntu cd and follow the suggestions,that`s it.
Last edited by alan_ri; 01-24-2008 at 02:21 PM.