Using docker on Win 7 (?)

I have installed docker toolbox on Win7 from here, successfully. If I open the mos web terminal, and try mos build --local, it replies "Docker toolbox found’, does a whole lot of fetching, handling and mounting etc then finnally says:

docker: error during connect: Post dial tcp connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
See ‘docker run --help’.
Error: exit status 125
/src/cli/main.go:198: build failed

any suggestions?