Find Wifi Password Already Connected in window

1-Press start and type CMD, right-click on the Command Prompt option shown
as a search result and click on Run as administrator.  
2-netsh wlan show profile
Profiles on interface Wi-Fi:

Group policy profiles (read only)
---------------------------------
    <None>

User profiles
-------------
    All User Profile     : vv@smart
    All User Profile     : YOURSSID
    All User Profile     : Smart@home
    All User Profile     : ????
    All User Profile     : Wwwiphone
    All User Profile     : salasangkatvealvong
3-netsh wlan show profile name="YOURSSID" key=clear
then please look on word "Key content"