Macbook Pro suddenly stops connecting to wifi

So yesterday, my macbook pro suddenly stopped connecting to any wifi sources at all. Instead after trying to connect, it just gives me the icon with the ! mark, saying that there is no connection made. I've tried multiple routers/sources, and they all don't work. The only reason I'm even connected to the internet right now is through tethering via usb (when I try to make my phone a hotspot, my computer doesn't read it, of course).
Does anyone have any idea why this would happen?
My software is up to date, completely. Macbook Pro, 2010 model, OS X Lion 10.7.3

Give a call to ISP tech support.
If you have time to read, the link below will take you to the Apple support site.
http://support.apple.com/kb/HT4628?viewlocale=en_US

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http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
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============================
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=====================
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Macbook Pro suddenly stops connecting to wifi

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