A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
If that 'Repair Now' button is not resolving the problem, then the best option is to perform a full repair of your Office installation.
Open the Settings App (gear icon on your Start Menu)
Go to Apps - Installed Apps, 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.