-open regedit (start\run, type regedit)
-expand until you are in: HKEY_CLASSES_ROOT\Folder\shell
-if the key 'shell' does not exist, right click on 'Folder' and add new key and name it 'shell'
-to add the item right click on 'shell' and create a new key, the name of this key will be what appears in the menu. I named mine "cmd"
-next right click your newly created key "cmd" and create another key under it named "command"
-double click the default entry in this folder and type in command.exe
-that's it your done, now when you right click on a folder the option to open a command prompt will be there!