Docker Installation Error

I am getting the following error when trying to execute the docker run hello-world or docker images command program in windows PowerShell.

docker: error during connect: In the default daemon configuration on Windows, the docker client must be run with elevated privileges to connect.: Post http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.24/containers/create: open //./pipe/docker_engine: The system cannot find the file specified.

Can anyone please help ?

Thanks,
Varun.