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Windows 7: all video files give error "class not registered" when trying to play

13 Jul 2012   #1

windows 7 x64
all video files give error "class not registered" when trying to play

The title explains it all just restored my computer and now any kind of videos files i try to play give me the error "Class not registered" what do i do?

btw, yes i did update all my video drivers.

My System SpecsSystem Spec
18 Jul 2012   #2

Windows 7 Home Premium 32 bit

Run SFC /scannow and check whether it helps. SFC /SCANNOW Command - System File Checker[2]=Performance Maintenance
My System SpecsSystem Spec
29 Sep 2012   #3

Windows 7 Home Premium 64-bit

I had this same problem and I was able to trace the cause of mine. I wanted to store document and program files on my D partition. To do this I had to create a new user for myself, so the OS would automatically store those files on D. Then a couple of months later I made a slideshow for a group I"m involved with and ran into the "class not registered error." To resolve this issue I had to locate the Windows Media Player program file in the Programs folder on C drive (the filename is wmplayer), and double-click it to launch the program. It then started adding the media files (audio, video, pics, etc.) to the new account I created under D drive. After this I was able to open and play these files with WMP.

Hope that helps someone out there.
My System SpecsSystem Spec


 all video files give error "class not registered" when trying to play

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