http://blogs.msdn.com/aaronru/archive/2009/06/09/please-do-not-install-visual-studio-2010-in-compatibility-mode.aspxIssue We've seen a number of people attempt to install Visual Studio 2010 in compatibility mode on Vista and Windows 7. This results in strange behavior, like setup not installing on Vista/Windows 7 and resulting in messages like: Windows XP SP2 is noten-USCommunityServer 2.1 SP1 (Build: 61025.2)