I should have given you a more complete answer. Before I wrote my first post, I checked and found that your graphics card supports directx 7. Since the minimum requirement for CS:S is directx 7, you should be fine in that area. That said, when you say it doesn't work, what do you mean exactly?
Please post the other specifications of your system (brands and models if known). It could be helpful in diagnosing your problem. I don't know if I'll have the answer to your problem but someone else might.