I've recently installed the nvidia drivers on my comp. I have Mandrake 8.0 and TNT2 ultra video card. Everything appears to be installed corretly. I just cannot figure out how to edit the xf86config-4 file to look for the nvidia drivers. I know the commands to type into the file but when I try I get the message that I don't have permission to write this file. What do I need to do to edit this file and save it.