Poser 4 is a royal pain in the ass compared to Poser 5. If you have lots of stuff with Bump maps, you need to convert all the bump maps from "jpg" to "bum" bump maps. You could easily spend a few hours searching and converting because some artists don't take the time to inform you of that situation. And the darned bum bump maps consume large amounts of hard drive space as well. On the other hand, Poser 5 uses jpg bump maps, and require no conversion. There is less space consumed on your hard drive. You can easily make customized thumbnails with Poser 5. Not so with Poser 4. If you're going to do serious graphics work, you need an up-to-date computer with at least 512mb of ram, and the largest hard drive you can afford. You really should get Windows XP as well.