Hi Janis,
Thank you for posting your query in Microsoft Community Forum.
We need more information to help you better.
1) Through where you are downloading the Windows media player?
2) Have you made any changes to the computer prior to the issue?
Kindly be informed that Windows media player will be available in Windows by default once you have installed Windows 10 in your computer.
You may find the Windows media player in your computer by searching for
Windows media player in the Windows search bar and then you may click on the
Windows media player from the search bar results to access the Windows media player.
Run the Windows media player settings troubleshooter and check if it helps.
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Press Windows + X keys on the keyboard and select
Control Panel
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Type Troubleshooting in the search bar on the
Control Panel.
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Click on View all on the left navigation pane.
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Click on Windows media player settings to run the Windows media player settings troubleshooter.
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Click on Advanced on the Windows media player settings troubleshooter dialog box and click on
Run as administrator (Enter the credentials if required).
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Click on Next and follow onscreen instruction complete the Windows media player settings troubleshooter.
The Advanced Systems Format (ASF) is the preferred Windows Media file format. With Windows Media Player, if the appropriate codecs are installed on your computer, you can play audio content, video content, or both, that is compressed
with a wide variety of codecs and that is stored in an .asf file.
You may refer to the below article for more information about supported multimedia file types in Window media player.
Information about the Multimedia file types that Windows Media Player supports
http://support.microsoft.com/kb/316992/
I hope the above information helps. Kindly let us know if you need any further assistance with Windows. We are glad to assist you.
Thank you.