[Roy Dennis]

Don’t know whats happening but just try this:

From the All apps look for K-lite codec pac expand that and see if you have codec tweak tool, open that.

At the bottom of that dialog is Wnn7dsfilterTweaker Button marked as preferred decoders, click that to open that dialog.
Take a note of the first few selection buttons, are they mostly showing as Microsoft selected or the recommended option?
At the bottom of that dialog select “Reset Button”
That should give you a Yes or No answer button.
If yours was mostly showing Microsoft buttons selected choose NO
which should change them all to the K-lite defaults.
If they are already selected as default then choose Yes which should default them all to Microsoft.

I would then reboot computer before trying out. if no different or worse you can reverse the settings by opening the Reset button again and choose the opposite setting to which you chose the first time.