Try the following:
Close all Fluent/Ansys Programs.
Open Windows File Explorer and type in the following in the address line:
%APPDATA%\Ansys
This will take you to your APPDATA\Ansys directory.
You should see a directory named: v231 (Or version you are using)
Rename that directory to v231.old
Now try to run.
You are navigating away from the AIS Discovery experience