Docker fails to start after settings are applied

Hi I am new to Docker. I have successfully installed it and used it to perform some basic tasks but when I try and change the resources in settings it requires a restart and it then fails to start (red icon in bottom left corner). If I re-apply factory settings I am able to use it again but these settings are not sufficient for tasks required.

docker: error during connect: This error may indicate that the docker daemon is not running.: Post http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.24/containers/create: open //./pipe/docker_engine: The system cannot find the file specified.