sorry for misunderstanding your post the first time around.
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-Why is this happening?
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it is possible that the networks are password protected. thus, you would need a username/password to access them.
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-Is there some kind of settings that I can change to improve my LAN card performance.
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http://www.microsoft.com/athome/more...elesstips.mspx
http://lifehacker.com/software/lifeh...pps-306436.php