umm, you are pointing to the pci-e slot witorek or however you spell that, he would need to put it into one of the slots under that. all you should have to do is turn off the comp, plug in the card, turn it on, and install the drivers, if you have integrated video you shouldn't even have to uninstall anything
edit; oh i just read that you don't have agp slots, how freakin old is that thing???? you need a new mobo for sure if you want to do any kind of gaming.