Q:

How to delete Wi-Fi password on shutdown?

I use a wireless network on my Windows 7 and 8. The problem is that I don't want to store the password I entered so I need to know if there is any method to delete saved passwords every time I shutdown the PC so no one can get the password anymore.

A:

You can delete the stored profile of every WLAN interface. By runnig following command.
netsh wlan delete profile name=[profile name] interface=[interface name]

This will delete, network from network list as well as password. But I think it will solve your problem.
You can save it as a fileName.bat and double click on system shut down, if you use same network every time, or you can do it automaticly on system shutdown open gpedit.msc to open the Group Policy Editor,
Navigate to Computer Configuration-> Windows Settings -> Scripts (Startup/Shutdow)
To delete all networks at one you could run this command. 
netsh wlan delete profile name=*

Google out for more usage of netsh to adjust it to your need. I hope this will help.

