A family of Microsoft word processing software products for creating web, email, and print documents.
Which Office product is this? Specifically, what is the name of the product? Microsoft 365? Office Home & Business? Something else? I would recommend an Online Repair.
First verify that you see your Office product in your account at https://account.microsoft.com/services so that you can reinstall if necessary—and it usually will be necessary following a "complete" repair (see below).
Do the following: Restart your PC and then start the Online Repair from Windows Settings. For more, read the article at https://support.microsoft.com/en-us/office/lifecycle/repair-an-office-application .