Going from 7 32 bit to 7 64 bit

[zrally]

I am "transplanting" a 1 TB hard drive with Windows 7 32 bit on it into a new system that I will run Windows 64 bit. The drive already has 7 Ultimate 32 bit on it.
How do I upgrade to 7 64 bit? Is it possible on that drive?

Thanks very much.

[PhilXP]

You can't upgrade 32bit to 64bit. You must do a clean install.
That applies to any hard drive.