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usb hdd not recognised and mmc class not registered message since 8.1 upgrade

Posted on 2014-04-01
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Last Modified: 2014-06-02
User cannot attach any usb hard drives to laptop recently upgraded to Win 8.1.  Cannot open device manager. Get message "Class not registered" . Same message for any mmc.exe console.  USB HDDs make USB device recognition beeps when plugged in but never appear in windows explorer.
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Question by:alangbx
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by:Scott Thomson
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You upgraded from 7?
Also does the bubble appear down the bottom right saying this device did not install successfully..?

I would suggest a fresh install
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by:Lior Karasenti
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Try to run sfc /scannow from elevated command prompt and see if the problem persists


 http://support.microsoft.com/kb/929833/en
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by:alangbx
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The upgrade to 8.1 was from Windows 8.0 .  It was working fine with 8.0 . No bubble.  Device just doesn't show up.  Client really doesn't want to re-install.  There is a lot of business software installed on this machine and it would be a lot of pain to get it back to where it is. I don't know if I can revert to Windows 8 without losing user settings and applications.  Can't help feeling this is a registry / driver issue if I could just get my head around it.
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by:nobus
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do the drive s show in disk management?
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by:alangbx
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I think this is part of the problem. I can't get into disk management or device manager or any mmc console . I get the same message "Class not registered" for all of the above.
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by:alangbx
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My client has unfortunately decided to live with the issue since he doesn't want to give it to me for long enough for me to have a reasonable chance of fixing it. So, I never got to run sfc /scannow even though it was suggested by two people.  We will never know what caused this, I guess.  If he wants it fixed in future he may have to re-install Windows 8 from scratch.
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by:nobus
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that's life- and tx for the update!
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by:Scott Thomson
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The client is always right??
ha-ha oh well. At least you most likely know the cause of the problem.
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