Move Windows 7 to a new PC

Hi, I have Win7 Home Premium installed on 3 computers at home - purchased a Family Pack to install on 3 pc's. One of my pc's (old P4) is dying and I am replacing it with a new pc and want to disable/uninstall windows from this pc and install it on the new pc. The old pc had XP then I installed win 7 release candidate and then win 7 (32 bit) - now want to install 64 bit on new machine. Advice please!

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