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

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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Alan Bateman
Asked:
Alan Bateman
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2 Solutions
 
Scott ThomsonCommented:
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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Lior KarasentiCommented:
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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Alan BatemanAuthor Commented:
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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nobusCommented:
do the drive s show in disk management?
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Alan BatemanAuthor Commented:
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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nobusCommented:
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Alan BatemanAuthor Commented:
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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nobusCommented:
that's life- and tx for the update!
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Scott ThomsonCommented:
The client is always right??
ha-ha oh well. At least you most likely know the cause of the problem.
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