How to do the windows equivalent of "format C:"?

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http://askubuntu.com – Bought a second hand laptop with no OS. Installed Ubuntu and have been running it now for about a year without any problems. Now need to use more windows applications (childrens educational applications that just won't run in Ubuntu). I already have a spare copy and licence codes for XP and would like to do either of the following: 1) completely wipe/erase Ubuntu from the laptop, then install XP , and then run Ubunto with dual boot. (the only thing we do with this laptop is browse the internet. we have no data saved to the hard drive so we don't even need a backup) 2) create a new partiti (HowTos)