Q. Do I need a separate activation key for 32- and 64-bit versions of Windows?

A. There aren’t separate keys for 32- and 64-bit Windows. If you have a key for a certain edition of Windows, you can activate either architecture. For example, if I have a key for Windows 7 Ultimate, I can use it to activate either a 32- or 64-bit instance of Windows 7 Ultimate.

• Q. If I'm running a 64-bit version of Windows, do I need 64-bit versions of all my applications? Or do I need to use a virtual machine (VM) to run a 32-bit OS?
• Windows 7 Upgrade Scenario 2: Upgrade from 32-bit Windows Vista/XP to 64-bit Windows 7
• Q. Does Windows Virtual PC in Windows 7 support 64-bit guest OSs?
• Q. Why are 64-bit domain controllers (DCs) better than 32-bit DCs?