That's not a game you want to run with that CPU, regardless of your graphics card.
There are some OLDER games at Steam that are cheaper, and would run far smoother on your system if your graphics card is okay (HD7750 or comparable).
You can try getting a bunch of Steam DEMOS (link to all the Demos, then click METASCORE to order from best to worst. Half Life 2 should be on top I believe).
There's a lot of good old games. Newer ones that are less demanding tend to be top-down games like Torchlight and Diablo 3 (Starcraft 2 is demanding though).
So, try a bunch of DEMOS to get a feel for what your system can handle. I can't get METASCORE to order properly for some reason, I think the site has an issue because "recommended" under Demos...