Want to win some prizes while playing GTA:IV this weekend? Well you are in luck, Microsoft and Rockstar have teamed up to bring an exclusive Live weekend where you can win prizes and play against Rockstar employees starting September 26th. To enter the main contest head to the Xbox.com registration page and sign up. To enter for exclusive prizes, you must be a member of the Rockstar Social Club and sign in during the contest period. You can also download an exclusive gamerpic and theme on Xbox Live.