The AMD A4 is entry level as well as the 9500 GT. There are some long discussions where the owner had it working then some update and it stutters.

About all you can do is to reduce the graphics settings in the game as to get this to what I see games calling for today would need a bump in both the CPU and GPU.

See if the AMD A8 is available and compatible for your machine. Then you can pick a GPU from:
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html

Before you install either you'll want to see if your PSU is up to the task.
Bob