Vbox Failure after Update

First time I've gotten this error on a routine VirtualBox update:

EnumQueryServicesStatus:OpenService FAILED 1060

Its fix was to browse to C:\Program Files\Oracle\VirtualBox\drivers\vboxdrv and right-click "Install" VBoxDrv.inf (I tried installing it from the cmd line, and while it reported success, didn't actually work, hence the point & click).

Then, as Administrator, launch Powershell, browse to C:\Program Files\Oracle\VirtualBox\drivers\vboxdrv and type:

sc.exe query vboxdrv


SERVICE_NAME: vboxdrv
TYPE : 1 KERNEL_DRIVER
STATE : 1 STOPPED <-- Oh noes!

sc.exe start vboxdrv


SERVICE_NAME: vboxdrv
TYPE : 1 KERNEL_DRIVER
STATE : 4 RUNNING <-- Much better