If you have it saved on a Windows 7 computer, you can see it by right-clicking on the wireless network from the Available Networks list and choosing Properties. From there go to the Security tab and check the box to reveal the password.
Alternatively you can go into the Network and Sharing Center Control Panel. On the left, click on the Manage Wireless Networks link and then right-click on the wireless network to view its properties.
Hope this helps.
