FYI it will not be easy to install the FGLRX drivers on your system. Look around in the BIOS for an option to disable a Graphics chip.
Also, your ATI card has no driver installed. There is a section in the Ubuntu Wiki, but it says that it will most likely not work. You can try it, but it will PROBABLY BREAK YOUR SYSTEM
. The wiki is here
. Do read the warnings and do realize that you might break your system before trying the method there. It really is easier to disable a GPU if you have that option in the BIOS.