http://sqlserver.ro/blogs/cristians_blog/archive/2008/02/29/leap-year-issue.aspxAnnouncement from Microsoft: "We have recently discovered an issue with SQL Server 2008 CTPs that result in SQL Server 2008 not starting or installing on Feb 29 GMT only. We recommend that you do not run, install or upgrade this CTP on Feb 29 GMT to minimizeenCommunityServer 2.1 SP2 (Build: 61129.1)