无法运行docker Hello-World

Docker新手在这里！

我按照这个说明安装了Docker社区版（ https://docs.docker.com/docker-for-windows/install/#start-docker-for-windows ），但是我得到了运行hello-world的错误

PS C:\Users\ahkim> docker run hello-world Unable to find image 'hello-world:nanoserver' locally C:\Program Files\Docker\Docker\Resources\bin\docker.exe: Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers). See 'C:\Program Files\Docker\Docker\Resources\bin\docker.exe run --help'. 

我该如何解决？