UUID Already Exists Error When Registering a Virtual Hard Disk

When registering a hard disk with Oracle Virtual Box, if you get an error like the following:

It means you need to change the UUID of the disk.  This generally happens if you have cloned a disk.  To correct this, you need to run the VBoxManage program which comes with Virtual Box.  This is generally located in the C:\Program Files\Oracle\VirtualBox directory.   Open up a command prompt in this directory and do the following (filling in the name of your hard disk file where applicable:

VBoxManage internalcommands sethduuid c:\directory\MyHDFile.vhd