I'm running this on a high-end Dell Latitude. 525mb ram, 1ghz processor. It appears that this software was written by hackers. There is no way a professional software company would release a product with this many bugs in it. You have to save your work constantly to multiple backup files, since the program simply crashes and exits without so much as an error message displayed. It does things that are totally weird. I added a single fence section to the yard and it deleted the entire house. There a bugs throughout. It's hard to believe that whoever authorized release of this software at Broderbund actually used the product themselves. They were probably given a demo by a developer or a product manager who was under the gun.