Hi hungrystix1 , assuming that it used to work, and your version of Office is still a 32-bit version, have you tried a quick repair of Office?
To do this, in Windows 10, search for Control Panel, then Programs and Features, find Microsoft 365, right-click and choose Change, then confirm, then choose Quick Repair. Once that's done, restart AccountRight and try Excel again.
If that still doesn't work, repeat but choose Online instead of Quick repair, which will take a bit longer. Then restart AccountRight and try again.
To check your Office version, open Excel, go to File, Accounts, About Excel, and read off the top line in bold, which should end in "32-bit".
Let us know the result.