VBoxManage not working

[jrlowry]

I have several VMs created and running Windows Server 2012R2. Unfortunately I created one with a primary hard drive that is too small. I understand that this can be modified using VBoxManager in a Comand Prompt window and am attempting to resize the hard drive but continue to receive this error:

e:\VM\Cluster\NAS1>vboxmanage modifyhd nas1.vhd --type normal --resize 30720

VBoxManage.exe: error: Failed to create the VirtualBox object!
VBoxManage.exe: error: Code CO_E_SERVER_EXEC_FAILURE (0x80080005) - Server execution failed (extended info not available)
VBoxManage.exe: error: Most likely, the VirtualBox COM server is not running or failed to start.

I have modified my PATH statement such that I can use the VBoxManage command from any folder. VirtualBox is up and running when I submit this command but the VM that I'm attempting to modify is not.

I appreciate any assistance.