It says it was made for XP, however I would think it would work fine on 7 or vista if you just run it in compatibility mode. As far as a description, this is taken from a website:
Choose the path of righteousness or evil in this role-playing adventure game Every action determines character's skills, appearance, and morality Life story created from childhood through to adulthood and on to old age Based on the best-selling award-winning Xbox title: Fable Expanded content, greater customization, new quests, and enhanced graphics