You should be able to use any Windows boot disk to accomplish this task. Simply boot from the disk and then reformat/remove the OS.
i recently attempted to reformat my computer on windows xp because of lost windows files but i now have created a partion on the drive and windows shows two systems on the start up and i would like to remove the old one because of all of the problems i had with it. so can anyone tell me how to safely remove the old partion and just leave the one i added which is working just fine ??