Facebook games can be picky and the latest flash and java handlers are important for proper script execution. In addition to this, Facebook games are memory and cpu HOGS, if you dont have at least a Pentium 4 and 1GB Ram the games might not run to well. My wife ran Cafe World on a Pentium 4 2.0 Ghz with 1GB Ram and Windows XP Pro SP3. The game ran laggy on that system until upgrading her to a new dual core.