To see stored wireless profiles, type:

   netsh wlan show profiles

This will show a list of saved profiles of your connected WLAN devices. Then you'll need to write/save/memorize the profile name that you want to change.

To see the stored key (WPA/WEP/etc) of a specific profile:

   netsh wlan show profiles name=[profile name] key=clear

You'll find the key content under security settings.

To delete a stored profile:

   netsh wlan delete profile name=[profile name]

This will delete the stored profile of every WLAN interface. If you want to delete the profile of a specific WLAN interface, you need to use the following:

   netsh wlan delete profile name=[profile name] interface=[interface name]