but i don't know if its possible without a format.
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Camera Equipment:
Canon 40D & Digital Rebel XT
Canon 500mm L IS USM
Canon 100-400mm L IS USM
kit lens
Sigma 70-300mm APO DG
Canon 430 EX Speedlight
Dynatran Tripod
Lowepro Mini Trekker AW backpack
there is a dell xp version, I have it, used it on dells, I think it has something to do with the delll bios. I installed it on some old testbeds that I have.
change the last 3 digits of the Pid key to "OEM" ie from Pid=55034000 to Pid=55034OEM.
Then repair/reinstall Windows from the harddrive files ... or copy them onto a new cd, for that matter .... you'll need an OEM cd key to complete this though.