Assassin's creed seems to be a big deal on my computer, it lags like crazy and the games not enjoyable the people talking in the scenes finish and the animation of the video keeps going. So this computer just wont do it.

and since this computer wont be just for gaming but also maya I should be able to use the graphics card I have now. It's worked well on other games.

I would also like to keep it at around $1000 if possible, and I do multi task like crazy.