Question about operating system

Hello.
I just got lenovo T400. I have question about operating system. I choose OS (Windows XP Professional preinstalled through downgrade rights in Genuine Windows 7 Professional). When I get the laptop, Windows XP is preinstalled but I don’t know how to upgrade to Window 7. Please, tell me the way to upgrade.
Have a nice day

you'd need the disks, and would need to do a fresh install, i.e. you can't just upgrade it. everything will be gone  
T400s - 2815RW1 + Win7 Ultimate
Don't pm me for help! That's what the forum is for. Also, Google's nicer than me. Ask him.

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