Enable Run Command on Window 7

By hitting Win + R on the keyboard we can access to Run Command which is the simplest way to do so. Otherwise, you can re-enable the run dialog by right-clicking on the Start Button, selecting Properties, and then clicking Customize on the ensuing dialog window.

You’ll be taken to the Customize Start Menu screen.

 Check the “Run command” check box in the list

That's it there is Run Command on Start Menu.