[ubuntu] Wireless won't connect

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http://ubuntuforums.org – I've been using Ubuntu for a couple of years, but I'm still very much a noob. I took my laptop to an coffee shop two weeks ago and was able to connect to their free WiFi. However, since then, I have been unable to reconnect to my wireless router at home. I reset the router and did everything but I have no luck. My roommate uses Windows and he has no problem connecting. Every time I go to a site on Firefox, it says 'Loading' but doesn't connect. So, I was wondering if there was anything I can do to fix this. Thanks for your help! (HowTos)