Command Prompt Doesn't Open

I had the same issue and it was related to mining malware installed on my machine. To resolve:

Delete the SoundMixer file and folder in your app data: %appdata%\Microsoft\Microsoft\SoundMixer\SoundMixer.exe
Go to windows registry and go to HKCU\Software\Microsoft\Command Processor and remove key AutoRun.

source: https://forums.windowscentral.com/windows-10/466299-unable-launch-command-prompt.html

Apparently you have set the width and/height to an incorrect number.

To fix this, open the startmenu and search for Command Prompt. But don't open it. Instead, right-click it and select properties.

Head over to the layout tab and reset its settings to the default: width: 80, height: 25 and press ok.

The problem should now be solved.

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