FirstBootFailure: This import request failed because the Windows instance failed to boot and establish network connectivity.
When Windows system drive is not C:
Our Windows installation should be located on drive C:.
Amazon EC2 fails to accept images of Windows installed on drive other than C:.
Change system drive letter to C via Windows Disk Management or via registry.
See Microsoft KB on how to change the system drive letter via registry http://support.microsoft.com/kb/223188