im a genuise!!!
i found out how to make x boot faster :
first i added >BusId "PCI:1:0:0" to my device lines in Xfree
i also added >Option "IgnoreDisplayDevices" "DFP, TV" to this
i opened /etc/modules and i added >nvidia
and now, x boots in a few seconds as it used to do
thank you very much for all of this help...
and thank u also, because thanks to u, i learned much things about linux (i am a little less newbie now)
and finally, thank u cause now ill be able to play on my linux ;-)