In some cases, Cortana stops working. This can be caused by many things but the most common reason is corrupted files and corrupted system components. In these types of cases where your Cortana suddenly stops working, you can re-register or reinstall the Cortana very easily. This usually resolves the issues with Cortana.
Method 1: Re-register (reinstall) Cortana for Current User
Here are the steps for re-registering and reinstalling Cortana for the Current User only
Method 2: Re-register (re-install) Cortana for All Users
You can re-register or reinstall Cortana for All Users on the system by following the steps given below Once the process is complete, restart your computer so all the changes are reflected in all profiles. Make sure that you run the above command as an administrator. If you are not an administrator, the UAC will prevent you from making changes to other profiles.
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