Graphics driver disaster

[s_h_a_d_o_w_s]

My dad's ubuntu box (7.04) had no graphics card. I installed a 8600gt in it and upgraded to 8.04 because the 180 nvidia drivers kept complaining of kernel headers.

Now I cant get the drivers working. How can I completely uninstall all nvidia drivers?

Whenever I try and check a driver to use in the "Hardware Drivers" section, they never activate.

[taurus]

Is your monitor connected to the add-on graphic card, nvidia? Make sure you go into the BIOS and turn off the onboard integrated graphic controller.