Macbook Pro's Wifi only works at my house, it has been working perfectly fine everywhere for the past 2 years

Hi there,
I have a 13-in Macbook Pro, 2.4 GHz Intel Core i5, Mac OS X Lion 10.7.5.
My wifi only works at my house. it has been fine for the past 2 years everywhere else, but now the wifi says its connected, but the internet doesnt work.
I have already tried a number of things to resolve this as it has been happening the past 2 months by looking on here and some have worked, but I can't seem to get anything to work anymore.
When I run the Network Diagnostics the Network Status is the following:
wifi- Green
Wifi-settings- Green
Network Settings- Red
ISP-Red
Internet Server-Red
I am home right now so the internet is working fine, but seeing as I use my macbook for school and work, I need it to work everywhere.
Thanks!

jcupat,
when you ran the Network Diagnostics above, was that run from home, or was it run away from home?
If it was away from home, do you get all green lights when you run it at home, or does it work properly despite not all of the lights being green?
Does your school or work allow anyone’s computer to connect wirelessly, or do these sites require whitelisting of some sort to permit a computer to use their respective networks?

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