[ubuntu] Nvidia X server settings config/xorg.conf wont save

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http://ubuntuforums.org – when i go to save the configuration of my Nvidia X server settings it gives me this error: Unable to create new X config backup file '/etc/X11/xorg.conf.backup'. when i first press the "save to X configuration file" it pops a window and says in the search box: /etc/X11/xorg.conf then it gives me the option to browse or press save/cancel so i press save then it gives me that error i stated before i been trying to fix this for the past week or 2 and i cant figure out the problem! thanks for the help (Hardware)