Update fails and cannot be removed

Friday 7/26/13 I got downloaded 2 Windows Updates repeatedly failing to be installed: - 2007 Microsoft Office Suite Service Pack 3 (SP3) Error Code 80246007 and - Security Update for Microsoft Office PowerPoint 2007 (KB2596764) Error Code 57E Since then repeated (unsuccessful) installation-attempts are causing undue delays at System Start and Shutdown but there seems to be no...