Need help Windows

Jun 22, 2018
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Howdy,
So just a few days ago I installed an SSD on my mothers Laptop because her 5200 rpm hard drive was running slower than usual after a windows update. Everything is going smooth enough and I have all of her files, but I was wondering if I could get her old drive running again on her Laptop. It really fudged itself up and after hours of tinkering in the settings I have access to the drive thru my PC. But now it no longer boots.

If you have any ideas why?

[Also please don't mind my name, I used an old account to log in haha]