Could not create a VHD file in Hyper V, "A Virtual Disk Provider for the specified file was not found"

Issue:
Could not create a VHD file in Hyper V, "A Virtual Disk Provider for the specified file was not found"
Cause:
Backup Exec 2010 R3 drivers for tape library modify registry settings.
Resolution:
http://support.microsoft.com/kb/2013544