Ali Ra, did you have a chance to read the readme on the nvidia site?
Also I'm also a newb with linux, but this may help you out, since I too also ran into the same problem, go to /etc/inittab, and edit it. Since you are using rh 7x, the value is prolly set at 5. You may want to try 3 instead, that way, if x starts it will just give you an error message, and bring you back to root console. This way you can diagnose your problems. After you log in, type "startx" to get into x mode.