Re: big Video Card Problems
Be sure to fully update your Ubuntu before installing the Nvidia drivers. Then reboot your PC and then install the drivers. Also, you will need to tell us which driver version you are using exactly.
If you have the same problem after doing the above, please check that /etc/X11/xorg.conf uses the Nvidia driver.
Otherwise, generate a new xorg.conf with nvidia-xconfig, copy it into place and reboot.