It might help if you said what the error message was. Just a thought.
John A
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Have you tried using a different browser, like Firefox or Opera ?
You might also want to try going to System Preferences->Network. Select your wireless adapter, and you should be able to see under "TCP/IP" the IP address of your router (usually 192.168.x.x). Under "DNS Servers", add this IP address, apply your settings, and try again.
John A
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Does your internet work correctly if you hook up your Mac directly to your Internet (ie. bypassing the router)?
John A
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