visual effects could not enabled on intel GM965/GL960

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http://askubuntu.com – I can't enable visual effects, I'm using lucid (10,04), my card is intel GM965/GL960, when i run compiz --replace it come back with compiz (core) - Error: Screen 0 on display ":0.0" already has a window manager; try using the --replace option to replace the current window manager. compiz (core) - Fatal: No manageable screens found on display :0.0 compiz was running good before I installed compiz plugins (HowTos)