External Command Failed 30091 – Ms Office

External Command Failed 30091 One or more third-party programs failed to complete successfully. For more information, contact your system administrator.
I was installing Microsoft Office 2010 when this “External Command Failed” error happened. How do I fix this problem? I really need this installed because my files are in 2010 and if I save them on an older version some modifications would not work on the old versions.
