https //support.microsoft.com to Check for Guidance : How to get help in Windows

Here are a few different ways to find help for Windows

• Search for help – Enter a question or keywords in the search box on the taskbar to find apps, files, settings, and get help from the web.
• support.microsoft.com – Head over to support.microsoft.com/windows to find answers to more complex problems, browse support content in different categories, and contact support.
• Get help – Select the Get help link when you’re in Settings to learn more about the setting you’re using and find answers to your questions.

Missing codec Please try again. If the problem continues, visit https://support.microsoft.com to check for guidance. 0x887a0004

I would suggest using VLC player, as this can play almost any media file without any additional codecs:

https://www.videolan.org/

Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Activate Office

Activate Microsoft 365 or a non-subscription version of Office

When you start an Office app that’s not activated, you’ll be prompted to sign in to Office. Be sure to sign in using the Microsoft account, or work or school account, that you used to buy or subscribe to Microsoft 365.

 

If the Activation wizard appears, Office needs your help to activate. Follow the prompts in the wizard to activate Office.