My Macbook Pro suddenly, and for no apparent reason, will not connect to the internet?

About a week ago I went to go online and my computer said I had no internet connection. Around that same time I noticed that my background on my desk top was back to the factory set background it came with, but I did not change it. That is the only thing I noticed out of sorts. I asked the other members of my family if their computers had internet and they DO. So does my iPod. I knew it was not my internet service, but my computer.
There is a "!" on the internet signal icon (top right). When I click on it I get a message in the drop down menu that says "Alert: No Internet Connection...." When I click on that, I get "Network Diagnostics" pane asking me to select location. I choose 'automatic', 'continue', then 'Wi-Fi' and 'continue'. Then it asks me to select Wi-Fi network. I highlight my network then continue. At this point, the words on the left are Wi-Fi- with a green dot, Wi-Fi settings with a green dot, Network settings with a yellow dot, ISP with a green dot, and Interenet and Server both with red dots. Then it comes up * "Network Change Detected - your network configuration has changed. Click OK to proceed to the next step". When I click OK, it asks me for wireless security info. I choose WEP password and then put my password in, and check the box next to "remember password in keychain", then continue. Goes right back to the "Network Change Detected" message at the * above and all the dots to the left accept the Wi-Fi one are now RED. I just keep going in circles from there, continually coming back to this message no matter what I do! I have no idea what happened or what to do?!
Does anyone have any ideas? Please help! I am a student and don't have any money to take it to a professional. I am the only one in my house that has a Mac (everyone else has PC's) so no one can really help me troubleshoot. I'm not a techy at all, but can follow directions if anyone can give me specific steps to try. Thank you so much in advance!!!!!!!!!!!!!!!!!!

http://reviews.cnet.com/8301-13727_7-20025542-263.html
I have not tested the solution suggested in the article linked above.
But hope it helps.

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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

My Macbook Pro suddenly, and for no apparent reason, will not connect to the internet?

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