First of all you have to install the kernel sources, in Debian-like systems which use apt package management, issue this (you need the sources repository):
apt-get install linux-headers-$(uname -r)
this automatically extracts your kernel's version and installs the needed package for your kernel. Neat!
OK, now you need these stuff too:
apt-get install binutils make
these are necessary for building the kernel module of the video driver.
Now, you are ready to acquire the driver itself. Look for it here. Get the proper driver.
Now, shut down the X environment, give this file execute permission and execute it:
This was what my file was. Now you are shown a menu, follow the steps and you should get it installed. At last it asks you to choose whether to add proper options to the xorg.conf file or not. Choose yes and you're done!
Go and enjoy the power!