How to set up a dual boot of Windows 7 with pre-existing 10?

I am troubleshooting a problem with odd black screens when installing AMD video card drivers in Windows 10. ref. Black screen when installing AMD video drivers - Windows 10 Forums

Anyway, I was thinking of quickly installing Windows 7 on a spare partition, so I can better see (or rule out) if the graphic card hardware is the issue.

Are there any issues I should be aware of setting up a dual boot when 10 is already installed? I am no expert, and I'm a bit worried the the Windows 7 install will mess up the Windows 10 master boot record. It will be the same physical drive, but a different partition.

I will probably want to restore the boot configuration to Windows 10 only after testing.

Solved Reinstalling Windows 7 on 7/10 dual boot breaks dual boot - Windows 10 Forums

topgundcp said:

Boot into Windows 7. Open Disk Management and note the drive letter for Windows 10 then open Admin Command Prompt and type:
bcdboot X:\Windows
where X: is the drive letter of Windows 10 OS.

The above shows the fix if installing Windows 7 alongside Windows 10 breaks the Windows 10 boot.

Another useful tool is EasyBCD - register the non-commercial full version free:

EasyBCD - NeoSmart Technologies

Thanks Fafhrd.

I'm not a fan of dual-booting, but since this is a temporary install, why not just pull your Windows 10 drive and install a spare for Windows 7. Do your testing and then remove the temp drive, replacing it with your Windows 10 drive. Guaranteed not to damage the 10 drive's install.

DeaconFrost said:

I'm not a fan of dual-booting, but since this is a temporary install, why not just pull your Windows 10 drive and install a spare for Windows 7. Do your testing and then remove the temp drive, replacing it with your Windows 10 drive. Guaranteed not to damage the 10 drive's install.

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I like this idea.