You can get the correct wireless password ***** the Windows 7 PC connected the Wireless Network. Follow the steps below to get the WiFi password.
Click on the network/wireless icon at the bottom right of the screen (left to the clock)
From the list of networks, right-click on your wireless network name and click on Properties.
Then click on the Security tab.
Then click the box at Show characters.
This will show the password ***** the text box. Use that password ***** connect your TV to your network.
Another way is, press Windows and R keys at same time and this will bring Run window. Type ncpa.cpl and press enter. You will see the WiFi network adapter (with a Wireless icon). Right click on it and select Status. From the resulting window, click Wireless Properties button and click "Show Password" to see the password (under Security tab).
If you have any difficulty on following the steps above, please let me know and I will walk you through it.