wireless network problem

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http://www.ubuntux.org – running command line lsusb my usb device recognised as marvel semiconductor (dynamode dongle) but not seen in wireles connections used windows driver via madwifi but after installation my l/top freezes even after reboot no connection is made and i then remove the window drivers. (connection with Ethernet cable is not a problem) have spent hours reading forums and tried following all sorts of recommendations but must admit, defeat any help would be appreciated laptop is Samsung running 9.04 ubuntu (Distributions)