Moved internal hard drive to external USB 3.0 hard drive. Now I can't boot windows

I recently upgraded to an SSD in my laptop. When I removed the old hdd, I placed it in an external enclosure in case I needed to boot from it and restore data.

I would like to pull of my power settings to put on my new hard drive from the old install. Dell sets up some sort of settings that gets me far better battery life than the defaults.

However, when I boot windows from the USB, I get a BSoD with the 7B error. From my experience, the 7B error comes when you swap IDE/AHCI in BIOS, but as this is USB, those options aren't available.

How can I boot windows from my external, failing that, how can I extract a power plan from a non-booted windows.

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