Forgot the WEP or WPA key to a wireless network? If you've ever connected to that network from your PC, then the key can be retrieved. The freeware utility WirelessKeyView will reveal the keys to any network you've ever connected to using Windows' Wireless Zero Configuration (not 3rd party software). You can use the software to delete keys from old networks you no longer need and copy keys to the clipboard to send or save. This could be really useful when you're setting up your new laptop or if you need to give a key to a friend so they can use your wi-fi, but you can't remember your home network's key .You can download WirelessKeyView from here.