Sounds really strange. What's the problem exactly ? Is SainT launching and then games or demos are crashing ? Or is there a video error as soon as you run the emulator ? In that case your graphic card / operating system is not suited for Microsoft DirectX8. ( did you install dx8 ?)
If any dx8 demo are working ( please try to good old fr08 at http://theproduct.de
) , then SainT should run properly.