Hello Neal, and welcome to Seven Forums.
Windows 7 already has a Open command window here
item in the context menu of folders and drives. You would need to press and hold Shift and right click
on the folder or drive to see it by default.
Open Command Window Here
The tutorial below will show you how to not have to press Shift to be able to just right click on a folder or drive to see Open command window here
in the context menu.
Open Command Window Here - Add or Remove Shift + Right Click
In addition, the tutorial below will show you how to add Open command window here as Administrator
in the context menu of folders and drives to be able to open a elevated command prompt at that location.
Open Command Window Here as Administrator
Hope this helps,