Windows 7 wireless network won't connect?

For some reason my computer wont connect to my new modem that comcast set up for me.  All of the other devices seem to connect just fine but for this one windows 7 desktop says that the key or passphrase is wrong.  I checked to make sure it is correct and it is.  The only way I have found to make ot connect is to turn off the firewall and put in the password.  That worked for a while but isn't working anymore.  Anyone have any suggestions?
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1 Answer

Follow the instructions on this site.

But first download a new wireless driver fron te manufactures website of your computer.

For example, just google: Acer support, or Dell support, or Sony support ETC

Locate the modle of your system or click drivers > download the wireless driver and install it.

http://answers.microsoft.com/en-us/windows/forum/windows_7-networking/windows-7-wireless-connection-problem-no-wireless/43f61a9c-069b-49ab-9f5b-f52ec2b1ef7e
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