The August 10, 2021 security update appears to have broken my wmc decoders. I'm getting a video decoder "broken or not installed" error and no video or audio will displayed/play. I suspect it is "Windows Media MPEG-4 Video Decoder Remote Code Execution Vulnerability CVE-2021-36937" update.
I rolled back to an August 1 restore point and it is working, but I assume MS will push the update again.
Any ideas on how to fix the decoders so they will work after the update?
Windows update broke Decoder
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Change Windows Update to manual and don't update. As long as you use Windows 7 for WMC only, it will work fine.