On windows 7:
- Do a search for "cmd" on your Windows computer
- right-click cmd and left click "Pin to start menu" (Alternatively, right-click cmd - click copy and then paste to your desktop )
- right-click the cmd in your start menu or on your desktop (depending on choice 2 above) - left click properties
- inside the "start in" text box paste the location of your default start directory
- Press Apply and OK
Every time you click on the cmd in your start menu or your desktop shortcut, the CMD will open in your default location