'Class not registered' when trying to open video files, then worrying I've made matters worse!

[Windows 11]

Recently thumbnails have stopped displaying for some of my video files (primarily MOV files) and I am unable to play videos as I normally can - I get a window coming up saying 'class not registered'I can play them in 'Windows Media Player Legacy' but not in films and TV or media player, as I normally can.Doing a bit of searching around online, I came across a site called Make Use Of who amongst other thing suggested going to command prompt and running the following:FOR /R C:\ %G IN (*.dll) DO "%systemroot%\system32\regsvr32.exe" /s "%G" regsvr32 ExplorerFrame.dllWhich I did, but it brough

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