modprobe followed by the needed driver or kernel module, example:
modprobe 3c509 -----that would load the 3c509 kernel module for 3com509 based cards
the available kernel modules can be found in /usr/src/linux/drivers/net I believe, no suffix needed, just the first part.usually they are very small little programs written in c, they usually have "c" for a suffix.
dunno which one the nvidia LAN controller needs...I just checked the list, no nvidia module by the name nvidia, but that doesnt mean anything, you may have to google or check elsewhere to find out which one it is.....possibly compile one from source