Associated/Not Associated

I have a Dell Inspirn B120 and up to a couple of days ago was able to get on the internet via local wireless networks in my area. Now it is saying it is connected but I can't actually get online...The only thing I see that is different is that it's saying the link status is 'not associated' now. I don't know how to change that. Also, it's saying my firewall isn't turned on now but when I check it it says it is. I am very new to all this and would appreciate any help at all. Thanks.

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Jr Sr
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