Acrobat only shows up blurry

I’m still using Acrobat 9.5, and it’s always worked fine. However about two weeks ago it suddenly started appearing blurry (both the menu UI and pdf contents), like the scaling issue from Windows. PDFs also look bigger at the same Acrobat zoom level. However, going into Properties > Compatibility > Change High DPI Settings does nothing with any combination of options. If I set the display scaling to 100% instead of 150% it’s sharp, but then all the text and icons are too small across Windows.

Since it just started recently I assume there may have been a Windows update or something, but I tried rolling back the most recent update, and uninstalling recent programs (none of which I would have expected to conflict anyway), and none of those did anything either. Anyone have suggestions as to what the problem may be here? This is driving me up the wall because I use it all the time, and Adobe won’t even let you install Reader without uninstalling Acrobat Pro which I need.