This should work for Windows 7, Windows 8, and Windows 10.
Note: Unfortunately this trick will only work if you are a local administrator on your machine, if you are not you will be prompted by UAC for administrative credentials.
How to View That Forgotten Wireless Network Password on PC
To view your wireless network password we need to get to the settings for your network adapter, so press the Win + R keyboard combination and type ncpa.cpl in the run box, then hit the enter key.
You will now see all the network adapters in your machine, right-click on the wireless one and select Status from the context menu.
When the Wi-Fi Status dialog loads up, click on the Wireless Properties button.
Then you will need to switch over to the Security tab.
Finally, check the Show characters checkbox to reveal your password.
That’s all there is to it.
If you have any problem viewing yours notify using the comment box