Hey,
What is the wireless icon showing at the bottom right. Possibilities include:
Computer with world icon, Computer on its own, Computer with exclimation, Computer with cross.
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Also, make sure your pc isn't asking you to "connect" as it is "working offline". If it is go:
Start - Control Panel - Internet Options - Connections - (tick) Never dial a connection - click ok
Then
Internet explorer - File - untick work offline
Restart internet explorer
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start - run - cmd - ping
www.bbc.co.uk
(tell me what the response is)
Also
in the cmd window: ipconfig
tell me what it says there.
I'll be on here all day as i'm at work so get back and the response should be fast.