Look at the selector on this page. http://www.nvidia.com/Download/index.aspx?lang=en-us
If you need the GeForce 6 series, it looks like you use the current driver. I don't know if you are running a 32 bit or 64 bit distro. You want to make sure you have the correct package.
The version that shows up in the selector is Version: 185.18.14
Here is a web page listing the cards supported. Your card is in the list.
Check the names of the drivers you installed. I had two driver packages for SuSE. On was for the kernel driver, the other I think was the GL files.
If you decide to install it using the NVidia installer, you will need the kernel source installed. You will also have to build a nvidia kernel module after every kernel upgrade.