The point is,
You can check the minimum requirements for each games, ask Mr. Google for those infos.
If your system is below that, the possibility for your system to run those games is really small.
Even, if your system can run those games, it could be so, that the games are not really enjoyable.
You can try with your own risk.
Face it! C2D + GT520 is an old and weak as sh*t combination.
If you have something like Q6600 + HD7770 or nVidia equivalent, you are still in the gaming world quite good but...C2D + GT520? too weak dude...