NVIDIA anyone?

Somebody gave me a computer game that requires a more advanced graphics driver than the one I now have. It is my understanding that NVIDIA won't let you download updates for free the way most other outfits will do. Does anyone know of a site where I could download the latest NVIDIA driver? Right now I have nvidia g force 4 on an e-machine T3065, 3000+ AMD Athion XP Processor, and a 160 GB hard drive. My OS is Windows XP. Any suggestions?

Thanks!