here's how Steven1038 helped me. Plz note that this issue has been addressed many times b4 and you should search it before you ask it.
You need to download Linux Drivers from nvidia (
http://www.nvidia.com/object/linux_...y_ia32_1.0-4496 ).
1. After downloading hit control+alt+f1 or f2
2. Login as root
3. Type telinit 1
4. change the directory where the drivers are at
5. Type sh NVIDIA-Linux-x86-1.0-4496-pkg2.run or whatever the files called
6. hit accept, and it should install
7. type telinit 5 and everything should restart up
Then you got to edit a file. Open up a console, su into root.. use gedit or whatever word processor you like... gedit /etc/X11/XF86Config-4
Go down to Section "Device" and under there you should see Driver "nv"... change that to "nvidia" and hit control+alt+backspace, should restart X and see the nvidia splash screen
edit: btw keep the -opengl, makes it faster (for me anyways)