[CentOS] Video Card Not Recognized Installing CentOS 3.7

I set up a new system that includes the following:

ASUS AE8N-E Motherboard (NVIDIA nForce 4 Ultra Chipset)
AMD Athlon 64 3800+ Processor
OCZ PC3200 Gold Edition 1GB Memory
EVGA GeForce 6600 PCI-Express x16 Video Card
CentOS 3.7

The video card wasn't detected and I had to use the VESA driver 
(generic) when I installed CentOS 3.7. As this is the first time I've 
used a NVIDIA video card with Linux my knowledge is nil on this subject. 
After a quick review of the available video drivers that come with 
CentOS 3.7 I did a Google search and came up with this link:

 http://www.nvidia.com/object/linux_display_ia32_1.0-8762.html

 Linux Display Driver - IA32
 Version: 1.0-8762
 Operating System: Linux IA32
 Release Date: May 22, 2006

I downloaded this driver and attempted to install it. When I run this

# sh NVIDIA-Linux-x86-1.0-8762-pkg1.run

to install the driver I'm told that I'm running an X server and that I 
need to exit X before installing the NVIDIA driver. After some 
experimenting I'm left with two questions:

1. How do I exit the X server to install this video driver?

2. How do I restart the X server when the driver is installed?

Any other comments about this subject would be welcome.

Thanks,
Corwin Burgess