Hi - xorg.conf (usually in directory /etc/X11) is the configuration file for the graphical display, and specifies the display hardware and any extra tweaks needed. Most distributions will generate it automatically during installation or upgrades, but since you are going outside the packaging system you would have to edit it yourself.
It's possible that just changing the driver (under Section "Device") to "intel" (if that's what the new driver is called) will work. Just make sure you keep a copy of the original xorg.conf. If the graphical display fails to start you can always log in at the text console and restore the original version.
If X-windows crashes (quite likely if you change xorg.conf) the log file /var/log/Xorg.0.log usually gives some clue why.
Kernel modules are another story. If you need updates you will most likely have to compile a new kernel. Unless you have a lot of linux experience you would probably have an easier time moving to a distro that supports your hardware, like Debian Unstable or Ubuntu (not sure about the latter but they are usually quick on important updates).