Follow these simple steps to access Device Manager from the Command Prompt in Windows 7:
Note: Not comfortable working with commands? Luckily there are several ways to access Device Manager in Windows 7.
Click on the Windows 7 Start button.
Type the following command in the search box and then hit the Enter key:
Note: Technically, opening Device Manager from the Command Prompt would require that you actually open the Command Prompt program. However, running an executable program like this from the search box accomplishes the same thing.
The Windows 7 Device Manager will display immediately.