How can I get a better Wi-Fi connection from encrypted connections?

I just got a new laptop with wifi connection and theres this place called Access Connections in which I pick a certain connection. The problem is, i'm limited to the open network ones because the rest are encrypted and they always ask me for a network key. So how can i get those keys to get the better connection they offer?How can I get a better Wi-Fi connection from encrypted connections?
Ask the owner of the router/network for the key. Or setup your own wireless network: http://www.microsoft.com/athome/moredone鈥?/a>

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