Have you had a previous version of the driver installed???
If so Check the /etc/modules.conf file for an entry like 'alias char-major-195 NVdriver', and remove it.
The new one should say 'alias char-major-195 nvidia' (The old entry doesn't get removed by the new driver, you must remove it manually)
For some reason Nvidia change the driver name in the 4191 drivers.
Well, it doesn't seem to be a resolution problem.. As that monitor will handle 1024x768 ok..
I'll have to lookup what needs to be entered regarding the refresh rate. At that resolution it should be around 75Hz (Guessing from the LCD monitors we use at my office at the same res..)