Mmmm. There was no option to Roll Back the driver.
I uninstalled it (and the files), and on restarting the VM the same one came back.
VirtualBox Graphics Adapter (Microsoft Corporation - WDDM)
So now I'm wondering if the Guest Additions are actually installing. When I run them the two options are checked but greyed out. I could not uncheck them if I wanted.
- VirtualBox Guest Additions Main Files
- Direct 3D support (Experimental)
I guess I will need to experiment with different setups and installs.
Any other ideas, send 'em along!