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.
Restore full virtual machine or individual guest files from 19 common file systems directly from the backup file. Schedule VM backups with PowerShell scripts. Set desired time, lean back and let the script to notify you via email upon completion.