Excluded fauly windows update which caused the installation process to freeze. See http://www.infoworld.com/article/2608889/microsoft-windows/microsoft-re-releases-botched-windows-8-1-update-2-patch-kb-2975719.html and http://blogs.windows.com/bloggingwindows/2014/08/05/august-updates-for-windows-8-1-and-windows-server-2012-r2/ for details.

Change-Id: Ib0ebdafef8f3a5ac4087535b3ab160e1e52db373