http://ossmall.info/error-message-when-you-try-to-run-an-msi-file-to-install-an-add-in-for-visio-2007-on-a-windows-vista-based-computer-error-1720-there-is-a-problem-with-this-windows-installer-package/ Open Software Solutions Sat, 25 Apr 2009 08:14:12 +0000 hourly 1 http://wordpress.org/?v=3.3.1