I'm trying to get the driver for my Nvidia 7600 GT graphics card but everything I download either can't be read by my computer, or it won't work when I try to run the command to install it. I'm extremely new to Linux, so please try to explain things in a very simple and detailed way. What can I do to fix this? My current resolution is nauseating! I'm running Ubuntu if that matters.

If you're using Ubuntu, and using a recent version of it (say 8.04 or 7.10), you should have a tool called Restricted Drivers Manager somewhere in the System menu (in it's submenus). Run it - it probably asks for your password at some point - and your graphics card should be listed. Check the box to enable it (you need to click a button to apply) and it should automatically download and install the driver for you - this is the easiest way to get it working.

Second possibility is to open Synaptic package manager (again somewhere in the System menu) and try to find the nvidia driver package there and install that.

Third possibility is to head to nvidia's site, go to downloads, select your operating system and card model and download the file you're told (a .bin or .run file probably). Then you need to close X, the graphical server on which your graphical desktop runs, because the driver insists (or did last time I tried this) it's not running while you "manually" install it. You can probably do this by running
if that won't bring you to a command line login, try other numbers 2-5 (do not try 0, 1 or 6, they're reserved for halt, single-user and reboot). Once you login, use 'cd' command to change working directory where you downloaded the file, for example
See that the file is here:
then make it executable and run it with root privileges (could be .bin, .run or something else - you should know the name)
Then follow instructions. If it says you're missing something, install the missing things and re-try. You can install new packages like this, for example (or with aptitude):
or if you'd like to get back to graphical desktop,
Or if 5 isn't the right number, try 2-4 to get the right one.

After the driver is installed, reboot to make sure the module gets loaded correctly.

If your using Ubuntu you should use the restricted Driver Manager... Don't do it by hand, it can be done but its kind of confusing. Just go to the Manager and click the Box next to your Card, this should work perfectly fine (I used the same card under Ubuntu 7.10, before switching to other distros).

Well using that device manager it kept saying the device was installed and able to be used, but that there were errors with it. That's why I was trying to manually install it. I appreciate your help with this, and I think I will be able to get it to work now. I'll post again with an update of whether or not it worked.

install ENVY, and install the nvidia drivers using this program.
works for me like a charm every time.