Dave-So - we have almost identical systems, except I have 1 Gb ram. The only crash I've had was when I still hadn't set my preferences in Zone Alarm and ZA was still trying to get a response from me while Poser 5 was loading. I shut down Zone Alarm, set my preferences before starting Poser up again, and haven't had any trouble since. Don't know if that might offer any clue. Did you check your task manager?