A family of Microsoft word processing software products for creating web, email, and print documents.
The solution depends on the error you are seeing when you try to use the Word app.
1
If you are seeing an error indicating Word failed to start correctly or a popup with a 'Repair Now' button.
Before performing this process to ensure you do not loose the Office installation during the repair, please log into your Microsoft account on this link (https://account.microsoft.com/services/) and check to ensure your Office licence or Microsoft 365 subscription is listed correctly on your account.
Open the Settings App (gear icon on your Start Menu)
Go to Apps - Installed Apps or Apps and Features
Then, scroll down to find Microsoft Office or Microsoft 365.
Select that and choose Modify - Online Repair
That should fix any issues with your Office Installation.
2
If the error you see indicates an account, subscription or activation problem:
Open Word.
At the top right of Word, log out of Office.
Restart (not shut down) your PC, then log back into Office, is your licence/subscription then recognized correctly.
If not, log into your Microsoft account on this link, is your Office licence listed correctly there, or if that is a subscription, check the expiry date listed on your subscription, is that listed correctly.
https://account.microsoft.com/services/
If not, go to the Billing section, is it indicated your payment has been processed correctly.