Start Cmd.Exe by right-clicking explorer

Link to page where found:
https://secure.codeproject.com/shell/commandprompt.asp

This page has tremendous information on dealing with the Windows Shell & extensions as related to starting cmd.exe from explorer

and, because links tend to break - an excpert

Selecting this entry will open a DOS prompt with its current directory set to the folder you just right-clicked.

1. Open your registry (regedit)

2. Go to the following key: HKEY_CLASSES_ROOT\Folder\shell
3. Add this key: CmdPrompt and set its default value to: "Command Prompt"
4. Under this new key, add the following key: Command and set its default value to: "c:\winnt\system32\cmd.exe"

You should now have this tree in your registry:

That's it. Now, whenever you will right-click on a folder, the pop-up menu will contain an entry called "Command Prompt".