The Official SBS Blog : SBS 2008 Update Rollup 2 (KB 960911) Installation Failure: http://blogs.technet.com/sbs/archive/2009/05/07/sbs-2008-update-rollup-2-kb-960911-installation-failure.aspx
Read the complete post at http://msmvps.com/blogs/bradley/archive/2009/05/07/the-official-sbs-blog-sbs-2008-update-rollup-2-kb-960911-installation-failure.aspx