MacBook is connected to wifi but unable to surf the internet

I have a 1st generation white MacBook and I have been connected to my home wireless network for a few months now without any issues.
Today for the first time I took my MacBook to my friend's place to work on a project. I connected to his home wireless network, which was not password protected (hence I did not need to tweak any settings).
However upon returning home, I tried connecting to my home network and though I could surf the net, it was excruciatingly slow, much worse than a 56KB modem. Then suddenly without warning it stopped being able to surf the internet.
I have restarted my MacBook and my router several times. It can't be a problem with my home network as the other computers in the home (1 MacBook Pro, 1 Windows laptop, 1 netbook and 1 iPod Touch) can connect to the internet without any problem.
I tried going to System Preference>Network>Create New Location etc but it still doesn't work.
Can anyone offer a solution as to why I am facing this problem only after taking it to my friend's place? Could it be a virus or a corrupted network I connected to at my friend's?

I have just started having a similar problem.
I am using a free WiFi service at a local arts centre. I have used this service many, many times over the past few years and it works perfectly well. Until today. i turned on my MacBook and, as expected, it connected to the WiFi network perfectly. However, I could not connect to the internet. I tried with Chrome and Safari, I tried via iTunes and through mail, but nothing.
I know the WiFi is working, as there are other people around me using the network perfectly well, however I can't connect.
Not sure if this impacts it, but I am currently connected via a 3G dongle.
Can anyone please provide any assistance?
Thanks

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MacBook is connected to wifi but unable to surf the internet

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