Well, this applies if you are using a desktop. If it's a laptop, well I'm not too sure there. Never used laptops. Might be similar although I'm not sure if you can upgrade graphics in a cost effective manor. Again, good luck.

Well bud, you need to upgrade at least your video card to get the game to run properly. I might even suggest upgrading your CPU as well. Just to give you an example, my computer was similar in the hardware, here is what I did.

Research your motherboard, you can download CPUID to get specs, name, etc. Once you figure out what it is capable of in terms of which CPU it supports, type of ram, if it has a PCIE X16 slot to support upgraded graphics or not. (If you already knew this, I apologize just being thorough)

I upgraded my computer, it's an older intel LGA775 socket, to a Core 2 quad, Q9600. Upgraded the power supply to a 600watt. Then I got a new video card, PNY Geforce GT 730 with 1gb of GDDR5 ram. I also upgraded my RAM to 4gb of PC6400, 800mhz. All matching. This whole experience ran me about 250$ ordering used parts/amazon type deals. My computer runs Dayz perfectly fine on medium/medium high settings with a few tweaks in the video settings. I'm going to get 8gb of matching Ram eventually, but it's fine for now.

Hope this helps you. Cheers