I\'ve recently run into this problem after having used docker toolbox without a problem for a while.
Started happening after windows update?
Windows 10 Home - 64
I have the same error as you. In my case when I open VirtualBox after got error, it alerts that the VirtualBox is needed to update. So I install the newest one and open the "Docker Quickstart Terminal" shortcut again eventually, it worked. So I think that install the virtual box again or install before installing Docker ToolBox may solve this problem. ( i know there is someone install it first ). good luck.