To set "start command prompt here" in right click of all folder.

First go to run:
then write "regedit"
Then goto:-
HKEY_CLASSES_ROOT/Directory/shell/

Edit the default here.

(Default)    Start Command Prompt Here

After that create key prompt and in prompt create another key command then edit the value as in bold letter.

HKEY_CLASSES_ROOT/Directory/shell/prompt/command

(Default)    cmd.exe /kcd%1