...gone into more detail on the system I was upgrading. I apologize for any inconvenience that omission caused. In any case, it is an ASUS CM1740 with an AMD A8-Series APU A6-3820 (2.5GHz), 8GB RAM and running Windows 7 Home Premium 64-Bit.

As for the 32-bit vs. 64-bit... It appears that if the Windows 7 product key that you entered on the Validation screen shown in Figure C is for a 32-bit version of Windows 7, then you'll end up with a 32-bit version of Windows 8. Likewise, if you enter a Windows 7 product key for a 64-bit version of Windows 7, then you'll end up with a 64-bit version of Windows 8.

I started with Windows 7 Home Premium 64-Bit and ended up with Windows 8 Pro 64-bit.