[ubuntu] nvidea GeForce 8500GT driver problem

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http://ubuntuforums.org – i have ubuntu 8.10 (intrepid ibex) running on a custom pc with an nvideo 8500GT card and ubuntu doesnt seem to use the card to its full potential. i cant seem to download any updated proprietary drivers. the package manager method refuses to download and will not cancel once started, all i get is a download window that stays perpetually empty. manual download came up with a .run file which i have no idea how to install. i just swapped over from windows xp and i barely know what i'm doing thanks to my experience with dos. can someone help me get this driver installed? (Hardware)