That computer is basically a laptop made to look like a desktop. It is like any other laptop in that you can easliy upgrade the RAM or Harddrive but that is pretty much it. Graphics cards in laptops are very difficult to replace and most PC repair outlets will tell you that it can't be done. You need to completely disassemble the computer to access the graphics card assuming you can find a replacement(ebay is the only place I can think of and they are difficult to find there). If the graphics card is integrated like inerax is saying then it is basically built into the motherboard of the computer and is not replacable at all. A normal desktop computer with integrated graphics will still have pci-e expansion slots inside so you can disable the integrated graphics through the BIOS and install a standard graphics card. Unfortunately, it looks like you do not have that capability.