Lets see... Windows 2000 is the most stable OS there is out there, besides NT4. So it's not the OS. Ram is no problem 512 is more then enough. Computer is config'd properly, 3DMax runs wonderful. Speed is not an issue. So no, bad guesses Griggs.. lol, It is not the computer, nor even close, it is Bryce, and if you ever decide to actually read this message board more often, you will see tons of posts by people who are having the same problem with Bryce's instability. This is for both Bryce 4 and 5.