try looking on the back of your computer, on the left, there should be a 25-pin connector, that your monitor connects to. that is your intigrated graphics card. integrated crap wont do much these days. and a pci gfx card won't be much better
you'd have to have a computer that's 21 years old to have the "regular" PCI. PCI-16 is the standard in the PCI world. Of course now we have PCI-e, but as we see, you don't have PCI-e, don't worry about what it is.. let's say you have a crappy 32mb GFX card, and you play BF2 on the lowest settings. Then you play with an intigrated video card, and you can't even get past the first screen. Some intigrated video cards are better than others, but they are all pretty crappy