Wi-Fi not working only on Ubuntu computer?

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http://askubuntu.com – The Wi-Fi at our house does not work on my Asus notebook running Ubuntu 12.04. It works fine on all other devices except this one. Internet worked fine before I had Ubuntu and I had Windows 7, but we also had a different ISP and place. My roommate's Windows 7 notebook and netbook both work fine with the internet and so do all of our phones and iPods. I do not know what is wrong because it works fine EVERYWHERE else, but when I am connected to my own router at my house it is either EXTREMELY slow or it just loads and loads and loads. I have all of the correct drivers and all that so why is it j (HowTos)