I'm recently experiencing a total crash to my FS 9 and dedicate PC whilst flying at dusk/sunset only !It happens whith any aircraft, both add-ons and default cessna.I've already installed the new ZINERTEK WORLD ENVIRONMENT 2007 which reaches new heights in realism.Before, I always used Zinertek textures and it happened more seldom.The PC just switches off and I have to let condensers get colder and switch it on again.Can't determine whether it's a matter of software conflicts or hardware.Use a ATI RADEON X 1800, 2 Ghz RAM and 3,4 Intel processor.Many thanks in advance to whom will help me with right advice.Fortunato Guadalupi

i suggest you describe your challenge to the flightsim.com 'PC Hardware, Video And Audio Help' forum.i'll give my suggestion -- confirm that you computer case fan(s), CPU fan (if you have one) and video card fan are working. also make sure all vents in the computer case are clean and clear of obstruction.