Ugh!

First restart the computer, then......Is the program still shown in the Windows programs menu?   

Do you see a Tools - Repair updates choice in there?   See if that helps at all.   

If it doesnt, I'm afraid you're going to have to do a clean reinstall.  Its not as daunting as it sounds, but it will take a bit of time

https://proconnect.intuit.com/community/multi-user-mode/help/uninstall-rename-and-reinstall-proserie...