OS - Windows XP/Vista Processor ¿ 2.0 GHz P4 processor or equivalent Memory ¿ XP: 512 MB RAM / Vista: 768 MB RAM Hard Drive ¿ At least 300 MB of hard drive space for installation, plus additional space for created creatures. (600 MB for digital download) Video Card ¿ A 128 MB Video Card, with support for Pixel Shader 2.0