according to the website you provided it's using integrated video processing which uses your systems memory and processor. Now and days it's very uncommon for a mother board not to have AGP.
You're not currently using the slot right now, but I'd be suprised if you didn't have at least that. Which, if you open your computer should be the brown connector above the PCI slots which are positioned towards the rear of the computer to allow access to the rear by connected cards.
PCI express (PCI-E) is relative new and for the higher end of computing. BAsed upon the specifications of your computer I highly doubt it has a PCI-E slot.