Microsoft has released a new patch for the PC version of Halo, updating the game to version 1.05. The 4.6mb hot fix "addresses a rare crash bug that could occur if a malicious individual (hacker) purposely sends a malformed packet to a game server. In addition, it incorporates fixes to resolve compatibility problems with Windows XP SP2 and certain 256MB video cards, which could cause the game not to launch, or not to display chat messages". Thanks Blue.