Could not read from the boot medium! System halted

Brand new to docker here. Win 7, boot2docker 1.5.0 from https://github.com/boot2docker/windows-installer/releases .

Running start script:

initializing...
Virtual machine boot2docker-vm already exists

starting...
Waiting for VM and Docker daemon to start...
..........................................................................ooooooo

From there it just slowly adds o’s.

I go to the VirtualBox gui and look in the logs, and I see this:

00:00:00.654262 Guest Log: int13_harddisk: function 02, unmapped device for ELDL=80
00:00:00.654473 Guest Log: BIOS: Boot from Hard Disk 0 failed
00:00:00.656047 Guest Log: Could not read from the boot medium! System halted.

I’ve tried uninstalling/reinstalling as seemed to help others in other posts I’ve read, but so far I’ve had no luck.

Update: I solved my problem. There was no disk image in my VM folder. I happen to be in bizarro world where developers don’t get permanent admin rights to their machines except in dire circumstances. I had to get temporary rights and then run the installer “as Administrator”. Now it was able to create the disk image in the VM folder, and it is working.