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Also, if it is Half Life 2 you're talking about, at least it would run (just about) on the FX5200 because at least it supports DirectX 9. The Intel onboard graphics only officially works with OpenGL, though older games will probably work too.
However, you should get at least a mid range graphics card such as a Radeon 9600, or even high end ones like the 9800 which are still relatively cheap.