If your network username and password are saved, the checkbox is checked as shown as the figure a-1 and you can correctly access to the Internet, you may still be able to recover your network password.
How to Find Network Password
Step 1. Download Dialupass
Go to Dialupass’s download page, click the download link (1). Or you can download it directly to your computer: http://www.nirsoft.net/utils/dialupass.zip
Step 2. Run Dialupass
After you have downloaded the dialupass.zip, uncompress this zip file and you will see a file “Dialupass.exe”. Double-click on the Dialupass.exe, your forgotten netowrk password will be showed just like the figure a-3.
That is it on Windows Network Password – How Do I Change My Network Password in Windows.