Command Prompt Error

Windows

1. Click on Start. Go to Run. Users running Windows 10, Windows 8, Windows 7, or Vista, go to Search. Alternatively, use Windows key+R keyboard shortcut.

2. Type gpedit.msc and press Enter.

3. Navigate to User Configuration -> Administrative Templates -> System

4. In the work area on the right side, double-click on Prevent access to the command prompt

5. In the popup dialog, encircle Disabled and click OK.

6. Done. If it still doesn't work, restart your computer.

Source