|It looks like your PC is one of those (bad ideas) all-in-one PCs. Those are not very upgradeable, and I doubt you can upgrade the video card. I don't know if it has any internal slots, but on the web it says only about PC Card expandability, and you can't get PC Card Video cards.|
I would recommending buying a new PC. The other stats on your PC barely meet the minimum, and I've been running Sims 3 for a while and you will need more power in order to not be completely frustrated with it.