Running docker info from an elevated PowerShell prompt shows this error:
error during connect: Get http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.2
If you're using Docker for Windows, Then simply start the desktop app installed in C:\Program Files\Docker\Docker\Docker Desktop.exe
You can also stop Docker for Windows and run just the Docker daemon dockerd.exe. That'll only let you run Docker Windows Containers. dockerd.exe is in the program files directory.