Ok, I was able to find what looks like the drivers for your Onboard SIS Mirage 3 video card
SiS Mirage 3 Graphics - Xp and Vista drivers
Now, being said that, I am thinking that your card is not capable of rendering the game and you would need to buy a new card.
It looks like your motherboard supports a PCIe video card. You can have a nice card for about 50 to 100 dollars... the specs on your board do not state how powerful your PSU is but I doubt it will be anything bigger than 300w so be careful when choosing a video card as it may not be able to handle it.
Don't be scare to ask questions if I am confusing you more than helping you
