What does /sbin/modprobe NVdriver
(as root) tell you? Anything?
My XF86Config is here
, but I'm not sure that will help (I don't run Mandrake, so a lot of things will be different from your config file).
When you do an ls /dev
are most of the files in there symlinks (colored light blue)? Or are they actual devices (colored yellow)? Not all of them will be either (and there will be some files that are other colors as well), but you should see a predominance of either light blue or yellow. Post which.