[ubuntu] How to install nvidia drivers?

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http://ubuntuforums.org – Hi, I've been trying to get my graphic card working under ubuntu and opensuse but to no avail. First, i tried through additional drivers, but after installation it keeps saying "this driver is activated but not currently in use". That is 3D-accelerated proprietary graphics driver for NVIDIA cards. (version current). Nvidia settings panel says: "You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server." The thing is when I run 'nvidia-xconfig' it replaces my xorg.conf (Hardware)