This how to guide is for people who have forgotten their wireless network password but already have a computer connected to the wireless network.
Prerequisite: You need to be a member of the administrators group or be aware of the administrator’s password.
On the computer that is connected to the wireless network, navigate to Start – Control Panel – Network and Sharing Center. Select Change adapter settings in the left hand pane.
Right click the wireless adapter and select Status from the drop down menu.
The Wi-Fi status dialog box appears. Click on Wireless Properties.
Thee Wireless Network Properties dialog box opens. Navigate to the Security tab.
The Network Security key is where the password is located but its characters are shown as black dots by default for security purposes. Simply tick show characters to show your password.