Internet not working on Late 09 Air - working fine on all other devices

Hi
My Late 09 MacBook Air has been working a treat, not a spot of bother. All of a sudden, about 5 minutes ago, I've gone to go online to download some research papers (I'm *trying* to write an essay) and it won't load anything. Not even my Twitter app. It is connected to the right network, which is working absolutely fine on every other device in the house (windows computers, iphone etc). I'm stumped! I've turned it off and on twice, the way that us clueless folk do.. now I don't know what to do.
Any advice would be fantastic.
Thanks

I've done that, several times now, both on the router and the computer.
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