If so, then you've got issues with something deleting your devices. Try something like this (as root):
for i in 0 1 2 3 ; do
mknod /dev/nvidia$i c 195 $i
mknod /dev/nvidiactl c 195 255
If, on the other hand, NVdriver isn't listed in lsmod's output, then load it -- modprobe NVdriver
and check to see if the devices are there. If not, do the mknod stuff above.
You can edit /etc/modules.conf to make the driver load automatically on every boot, if that was the problem (the line is either alias char-major-195 NVdriver
or alias /dev/nvidia* NVdriver
, depending on whether or not you use devfs).