Question about Dell Inspiron 6400 Notebook

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My wireless connection is strange in that it works in some places and doesn't in others. It will always pick up the wireless connection and say it is connected, but sometimes will show 'Internet Explorer could not display the webpage' when I open the internet. Even if I am right next to the router it won't work. But then with some wireless connections it works fine. I have tried to diagnose the problem through the diagnostic tool, but it hasn't worked. It's so frustrating! I have a Dell Inspiron 6400.

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