As stated, onboard graphics can't handle games well. If this is a desktop computer I recommend you buy a quality video card. If it's a laptop, then that's probably the best that game will run, except for possibly lowering the resolution and/or graphics detail.
is there any way to add graphics to my acer aspire 2930z notebook ? if yes how much would it cost?
Your video specs:
Mobile Intel® GL40 Express Chipset with integrated 3D graphics, featuring Intel® Graphics Media Accelerator 4500M (Intel® GMA 4500M) with up to 1759 MB of Intel® Dynamic Video Memory Technology 5.0 (64 MB of dedicated system memory, up to 1695 MB of shared system memory), supporting Microsoft® DirectX® 10.