I'm having this problem many times when i lauch Houdini with more 6 mils it's begin crash and say Display Driver stopped …
Can any 1 help me solve this problem?

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It sounds like the rendering of the particles is taking more than 2s to render, and Windows is (un)helpfully resetting the driver for you because it thinks it's crashed. You can increase this limit to something more reasonable for production work, like 10s, by editing the registry keys with regedit, as noted here:

https://msdn.microsoft.com/en-us/library/windows/hardware/ff569918%28v=vs.85%29.aspx [msdn.microsoft.com]