The driver recommended by Ztcoracat didn't work, the console output is this:
1.-WARNING: You do not appear to have an NVIDIA GPU supported by the 295.59
NVIDIA Linux graphics driver installed in this system. For further
details, please see the appendix SUPPORTED NVIDIA GRAPHICS CHIPS in
the README available on the Linux driver download page at
2.-ERROR: You appear to be running an X server; please exit X before
installing. For further details, please see the section INSTALLING
THE NVIDIA DRIVER in the README available on the Linux driver
download page at www.nvidia.com
3.-ERROR: Installation has failed. Please see the file
'/var/log/nvidia-installer.log' for details. You may find
suggestions on fixing installation problems in the README available
on the Linux driver download page at www.nvidia.com
It's the same with the driver that I downloaded from the Nvidia web page. When I try to change the driver from the Driver Manager some times the driver is installed, but the result is the same, the whole screen is not updated at the same time. Some times when I change the driver from Driver Manager, after closing the Driver Manager window and opening it again it's using the same driver, as if nothing changed.
I couldn't take a screenshot of the update error, but I will continue trying (any recommendation is accepted).
If it helps, my computer is model is hp pavilion dv7-7005er, I have to mention that the original operating system was Windows 7, but I decided to install Linux mint 17 because more c++, c, c# development accessories.