I was trying to move my libraries off of my SSD. In doing so I accidentally moved my Documents library onto my drive D: (my HDD). When I realized that it did not work the way I wanted it to I tried to reset to default, but instead of moving the Documents library back to C: drive, it gives me an error.Click image for larger version. 

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EDIT: Sorry, I just found the thread I was looking for, completely fixed my problem, Thank You

P.S. Here's the thread if anyone wants it.

Restore Default Location of Personal Folders in Windows 10