Is a windows thing:
Might want to do what it says.
For Premiere to work properly you must have Windows Media Player installed.
This will depend on which exact version of windows you have.
The N and KN editions include the same functionality as the Windows 10 editions, except Windows Media Player and other related technologies.
Note that the editions of Windows 10 Enterprise and Windows 10 Pro LTSB (long-term service branch) do not include Windows Media Player.
You can also depend if I update Windows from a previous version, in this case you can do the following:
Copy the WMVCORE.DLL file from the C: \ Windows.old \ Windows \ System32 directory
And paste it in C: \ Windows \ System32