I think you'd have absolutely no problem running it on High settings. You may even be able to try maxed if you feel up to it. I've played Sims 3 on an Intel GMA X4500 before, and it wasn't even that bad, so it should run it completely fine.
Have fun.
Hey guys,
I came here in search of something to do when I'm not playing games, looking for a new computer, and whatever else I do on the internet. Glad I found this place, good to be here. :)