One of the best programs I have seen out. I have used it under win98 on my Intel 400, just make sure you have ram for it. I mainly use it on my win2k system and it is great. If you do get it, and I highly recommend it, be sure to read the docs BEFORE you start to set up your world. The nice thing about it is you can just use the parts you need, like the sky or the ground or water or lights. Well worth the money. Marque