Thanks for your reply. I don't know how to see which driver I am using now.
Can you help me finding it, please?
Also I have been trying and install the .run from website http://www.nvidia.it/object/linux_di....86.13_it.html
but I get some error. I would like to try any other solution before reinstalling those drivers. In this case, would you advice me to install in 9.10 or in 10.04?
PD: the "Hardware Drivers" section is empty both in 9.10 and 10.04 . Why?