Win7 32bit Home Premium to Win7 64bit Ultimate: Possible without Clean Install?

[Cannibal Corpse]

I just bought a ThinkPad T400, and 8GB DDR3 upgrade kit. After first log on, I realized the Windows 7 is 32bit. How can I upgrade to Ultimate x64 instead?

Thanks for your help.

 

[Cannibal Corpse]

OK, since no one replied, I will provide an answer:

http://www.sevenforums.com/installa...imate-possible-without-clean.html#post2118163

 

[gimp]

no.
you cannot change architecture without a clean install.