Boot2Docker under Windows 7 CMD window hangs forever

I’m new to docker and tried to install it under Windows 7/64 today. So far the installation went through. I rebooted and started Boot2DockerStart.

A CMD-Window appears, title "Boot2Docker Start"
and the following content shows:

Virtual machine boot2docker-vm already exists

Waiting for VM and Docker daemon to start…

Nothing seems to happen anymore rather than a bubble being added once in a while.


Replying to my own post:

I figured out that

boot2docker delete
boot2docker -v init
boot2docker start

finally solved my problem. Also I updated to the latest version of Virtualbox, 4.3.26 r98988

So far my problem is solved now but I have a different on (other thread - getting out of scaled mode)