[ubuntu] I couldn't enable visual effects in ubuntu

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http://ubuntuforums.org – Hello! i'm a new user to ubuntu and i installed it successfully with wubi installer inside my windows xp professional sp2. Whenever i enable desktop effects in my ubuntu from none to normal or extra. The system gives me a message like " desktop effects cannot be enabled":( my configuration is intel dual core 2.8GHz 1GB DDR1 RAM 80GB HDD zippys nVidia geforce fx5500 256MB DDR (Hardware)