How can I check for the list of my wireless networks?

I'm always able to see the list of my saved wireless networks on Windows Vista and 7 but not on Window XP. I can only see the name of the network that is connected to internet at that moment but I find it very difficult to get access to the list of those that are saved but not connected. Please, can someone help describe to me how I can access this list of my saved wireless networks as the KEYS to some of the saved wireless networks I'm using have been changed and they don't connect to internet but then I need to access them and delete them so that I can make fresh connections.