Accessing Device Manager from the Computer Management utility in Windows 7 is very easy.
You won't find Device Manager in your list of programs in the Start Menu because it's not really a program like the other software on your computer.
Follow the steps below to access Device Manager from the Computer Management utility in Windows 7:
Click on the Start button and then choose Control Panel.
Click on the System and Security link.
Note: If you're viewing the Large icons or Small icons view of Control Panel, you won't see this link. Simply click on the Administrative Tools icon and proceed to Step 4.
In the System and Security window, click on the Administrative Tools heading located near the bottom of the window.
From Administrative Tools, double-click on the Computer Management icon.
When Computer Management opens, click on Device Manager on the left side of the window, located toward the bottom of the list under System Tools.
Device Manager should now appear on the right side of the Computer Management window.
Note: If you don't see Device Manager listed, you may need to click on the |> icon next to the System Tools icon.