Upgrade Windows XP 32bit to Windows 7 64 bit

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http://superuser.com – Ive got a computer with windows XP 32bit installed on it and I want to upgrade/clean install it to Windows 7 64bit. I've tried the following: booting from the CD booting from USB I changed the bootoorder in my BIOs to boot from CD/USB first and I tried to format the hard drive but it won't let me do that. None of the above have worked and I'm running out of ideas, is there anything else I can try to install a fresh version of windows? (HowTos)