Please try renaming the user.config file. 

1. Locate your Intuit,_Inc file by going to  C:\Users\username\AppData\Local\Intuit,_Inc

    "username" should be your username for your computer.

2. Locate the correct folder in here. It should be named Protax21.exe_ with random symbols at the end.     You may have 2 of them, one for Basic and one for Core. 

3. In each of the above folders locate the 0.0.0.0 folder. Change or delete the user.config file