Ok. I've tried it on my personal computer at home, which is an Athlon II X2 240 (2.8 GHz, supports up to SSE4) with a Radeon HD4850. I downloaded your tests again, and tried to run them. Same thing happens, they run but nothing is shown. Since I use Windows 7 I noticed that the rendering shows in the preview when I hold my mouse over your program in the taskbar. The window is there, and can be focused. However, it is not shown on screen for some reason. Also, trying to minimize everything (WIN+M) makes the program crash. I've tried disabling Aero and closing every program I have, but with no success.