Thanks for the replies. I tried the Windows 10 photo program, but it didn't work that well for me. I actually found a free program yesterday called Rotation Pilot that will let you rotate to 1/10th of a degree. You can also draw the correct "horizon" using your mouse to drag a line across the bottom edge of the card/slab, and it will automatically rotate the scan to that horizon.
It's a little cumbersome because I have to do the scan, then open it in Rotation Pilot to fix the orientation, and then open in Paint to crop/edit. But, it gets everything completely square and it's a whole lot easier and faster that getting a perfect 90-degree angle on the scanner.
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Recovering Relapsed set collector.
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