[ubuntu] Nvidia geforce fx 5500 no desktop effects

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http://ubuntuforums.org – Alright, I have and Nvidia Geforce FX 5500 and the desktop effects will not enable, I've tried both versions of the drives provided in the administration->hardware drivers and still nothing. I want to try the Nvidia drivers from their website but when I try to run them, it says X-server is running, close and try again. How exactly do I close x-server so I can run and install the drivers? (Hardware)