Having solved my original error with ext pack see here and I have tried to start the VM only to get this error;
The virtual machine 'Windows 7' has terminated unexpectedly during startup with exit code 1 (0x1)
I'm guessing that because I reinstalled the plugin and pointed it to the VM shared folder that all would be Ok, but obviously not, I would rather not have to recreate the vm itself.
There are endless posts regarding the above error if you just google, some of which seem to make sense here but which one, as is usually the case it's not one fix fits all.
If do dpkg -l | grep virtualbox I get the following output,
ii openmediavault-virtualbox 3.0.8 all VirtualBox plugin for OpenMediaVault.
ii phpvirtualbox 5.0-5-2 all Web interface for VirtualBox.
ii virtualbox 5.1.26-dfsg-2 amd64 x86 virtualization solution - base binaries
ii virtualbox-dkms 5.1.14-dfsg-1 all x86 virtualization solution - kernel module sources for dkms
ii virtualbox-ext-pack-installer 5.1.26 all VirtualBox extension pack installer.