X doesnt start at startup

I am currently running kubuntu gutsy, but this bug was also happening on feisty, i am using an intel 102GGC2 motherboard with a 3.0 Ghz CPU with HT, 1 Gb of RAM (667 MHz) i have a winfast px7300 LE video card. after a clean install of gutsy everything works fine till i install the nvidia drivers, the system will show usplash at startup and the progress bar would reach the end, and instead of seeing the graphical boot screen i see a console one. i log in, but any attempt to startx would end up with a series of errors all circling around that there is no nvidia gpu found. at first i used to reinstall the driver and then do "sudo /etc/init.d/kdm restart", but then something amazed me, is that when i start the driver install, and i click accept for the license, it would tell me there is a driver and that it is going to be overwritten, if i say no, the installer exits and restarting kdm works fine. meaning that without any reinstallation happening kdm worked! im sorry for not any copy of the error messages.