A family of Microsoft word processing software products for creating web, email, and print documents.
The message could be from an older, expired trial version. Check your list of installed programs (if you are running Windows 10, look in the Apps & Features category of the Windows 10 Settings app). Uninstall any trial version that you find.
If this doesn't work, you can uninstall all Office software using the Uninstall support tool (see Option 2 in the article at https://support.microsoft.com/en-us/office/uninstall-office-from-a-pc-9dd49b83-264a-477a-8fcc-2fdf5dbf61d8) and then start fresh with a new installation from your account.