Change Operating system from WIn XP to Win 7

Hi Guys,
I have T400. When I purchased it I had Win XP pro on it. Now I want to change operating sytem to Win 7 and also would like to have 3 partitions.
Can someone guide me to step-by-step process or point me to source?
Thanks,

Hi bob99,
Did you create recovery discs before downgrading to XP? In case you didn't, then you would need to order them from lenovo.
Maliha (I don't work for lenovo)
ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
IdeaPad: U350
Apple:- Macbook Air [Snow Leopard]
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