Microsoft has released details of the
Windows Advanced Rasterization Platform (WARP), an option to be introduced in the DirectX implementation on Windows 7 that allows full DirectX 10 rendering using software-only rasterization. In other words it lets all rendering be done by the CPU, which although much, much slower than a dedicated graphics card, means any system will be able to run basic DX10 effects under Windows 7
In fact it'll run Crysis but only at about 3fps lol