I'm looking to upgrade my brother's video card on his computer, the only problem is I'm not entirely sure what the computer has for available PCI slots. It's still under warrenty so I can't open it without voiding it.
So how are you going to install a new video card if you can't open the computer??
Secondly your link doesn't work and you'll need to know what the power supply is before you can even consider a video card upgrade. It's likely you will need a new power supply and it's it's a Gateway, it's probably not even a standard size power supply.