Add nvidia to your /etc/modules file on a new line under scsi_hostadapter. Reboot and do lsmod (Or /sbin/lsmod) and see if the nvidia module is inserted.
It's sort of confusing as some distros do it differently. Gentoo, for example, uses /etc/modules.autoload instead.
"Floating in a dream-like state, I am the emporer of a parallel universe." --Arch Enemy
My xorg.conf file