you may have to set the wireless connection up again.
But details are short here.
Mark
I have recently updated from XP to Windows 7 and for some unexplained reason now I have a problem accessing the internet. I have put in a new network adaptor just in case the old one was on it's way out but still I have the problem. Just wondering if anyone else has experienced this problem and how they fixed it.

Chowhound
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TechRepublic