Its really a disappointing news for the Halo PC fans that Bungie delayed Halo 2 to Fall 2007. Halo 2 PC version was expected to release by May 8th, it was so near but then it is delayed. The reason for this is that they are concentrating on Halo 3 Beta that is to be released May 16th and also said they are working on the final touches to Halo 2 & promised to give the best experience to the players. Halo 2 PC is only run on Windows Vista & cannot be installed on Windows XP.