Ugh, sounds like you've done all the things I would have suggested.   

You can try one more thing before reinstalling the program.

Exit Proseries, restart the computer, don't start up Proseries but go to the Windows Programs menu and use REPAIR updates.

If that doesn't work, I think uninstall/rename/reinstall may be your only other option (aside from calling support). The rename part is important, you don't want it to just install into the same folder, that can leave the bad file or registry entry that's causing the issue.

https://proconnect.intuit.com/community/help-articles/help/uninstall-rename-and-reinstall-intuit-pro...