My lenovo G400s always auto shuts down when i play high-graphic games.why?

My lenovo G400s always shuts down saying i encountered a problem and it needs to shut down when i play high-graphic games. It usually says 'driver_irql_equal_or_less'. Can someone please help me with this issue? I can hardly play any of my games due to this.

Try updating your network drivers, both wired and wireless. Probably wouldn't hurt to update your graphics drivers as well. Should solve the issue. If not the only other thing I can think of off the top of my head would be a system restore.