[SOLVED] Help, I can't boot into Windows from my SSD after rewriting my other hard drive! How do I make my SSD bootable?

Sep 4, 2019
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I have two SATA devices installed in my computer: a 1 TB HDD and a 240 GB SSD. Previously, I had Windows on the HDD. I did a fresh install of Windows onto the SSD as well, then moved a bunch of my files onto the SSD. It was successful.
However, I installed Ubuntu over the HDD. It works, but now I'm unable to boot the SSD. I suspect this is because the Windows installation process was not enough to change the drive to bootable. How do I fix this?