"I'm attempting to change the operating system on my wife's computer from Windows 8 to 64-bit Windows 7 Pro. I spent 3 hours last night, found that I had no chance to success. Is there a way to downgrade Windows 8 to Windows 7 Pro?"
There may be problems with downgrading a Windows 8 PC, partly because some have new form factors that were never designed to run Windows 7. Windows 8 PCs are also different from the previous generation in having a new UEFI (Unified Extensible Firmware Interface) system with Secure Boot and Fast Startup. Clearly, Microsoft doesn't want users doing this. Anyway, there is a way to downgrade Windows 8. Clarify the tips and follow the instruction to achieve it.
Knowing the Tips before Downgrading Windows 8 to Windows 7
1. You can only downgrade Windows 8 Pro version.
2. You can only downgrade from PCs that have Windows 8 Pro preinstalled from the factory. Not the one upgraded to Windows 8 and wants to revert to Windows 7.
3. Backup your Windows 8 files because you will be doing a clean installation of Windows 7. All things get wiped.
4. You need the installation media and a valid product key for Windows 7 you own.