Ok, running all the latest updates, i.e. win7 and graphics drivers. Sometimes I can play for 40 minutes, sometimes 5...but eventually my computer shuts off. This only happens when I am playing Istaria. I have a Sony Vaio (i7, 4g ram, Nvidia 250M video card). I have tried changing the compatibility settings to all of the Win XP. My desktop power supply blew and took my motherboard with it so this is all I have at the moment. I was just wondering if anyone else has ran into this and if so, how did you fix it?