A family of Microsoft word processing software products for creating web, email, and print documents.
It's likely that a trial version of Office, maybe Microsoft 365, has been installed on your computer beside Office 2010, and that's what is expired.
Go to Windows Start > Settings > Apps and look for an Office entry that isn't 2010. If you find one, click it and then click Uninstall.
This should not affect Office 2010 or any of your documents. If 2010 shows any odd behavior, though, run a Quick Repair (https://support.office.com/en-us/article/Repair-an-Office-application).