Your failures are caused by previous files having a higher version than the ones you are trying to install.
Look at these log entries: MSI (s) (7C:58) [12:56:47:348]: Disallowing installation of component: {B755AE68-73F9-41F4-9777-A18D767B305B} since the same component with higher versioned keyfile exists MSI (s) (7C:58) [12:56:47:349]: Disallowing installation of component: {79901D9A-BA3B-4CBD-A8B1-7BE5DB09A995} since the same component with higher versioned keyfile exists I'm willing to bet that these two GUIDs correspond to these two components: MSI (s) (7C:58) [12:56:47:367]: Component: MT_Service_Component; Installed: Absent; Request: Local; Action: Null MSI (s) (7C:58) [12:56:47:367]: Component: MT_Admin_Component; Installed: Absent; Request: Local; Action: Null How exact you must follow the component rules is "relaxed" when you remove before you install, but it isn't a pass to exempt you from those rules. What remove-before-install does is let you mess with components' resources with fewer unexpected side effects. It doesn't let you willy-nilly ignore previous contents completely. I suspect that you have overlapping component GUIDs here: MSI (s) (7C:D4) [12:56:54:371]: Component: MyProgram_Administrator.exe; Installed: Local; Request: Absent; Action: Null MSI (s) (7C:D4) [12:56:54:372]: Component: MTService; Installed: Local; Request: Absent; Action: Null MSI (s) (7C:D4) [12:56:54:372]: Component: MTTransporter; Installed: Local; Request: Absent; Action: Null MSI (s) (7C:D4) [12:56:54:372]: Component: ATL71_Customer_Redist_____X86.3643236F_FC70_11D3_A536_0090278A1BB8; Installed: Local; Request: Absent; Action: FileAbsent MSI (s) (7C:D4) [12:56:54:372]: Component: ATL71_ANSI_Customer_Redist_____X86.3643236F_FC70_11D3_A536_0090278A1BB8; Installed: Local; Request: Absent; Action: Null MSI (s) (7C:D4) [12:56:54:375]: Component: __MyProgram_Administrator.exe65; Installed: Null; Request: Absent; Action: Null Windows Installer optimizes its operations by removing what isn't being upgraded. However, its determination of what is being upgraded depends on the rule that the relationship between component guid and keypath is properly maintained. I would recommend that you make sure that your MSI (re)uses the same component guids for all the same keypaths that are common between the two MSIs. I would further recommend that you make sure that your file versions are larger than those in the product you are replacing. It will do some detective work, but you will prevent the kinds of errors you are experiencing. BTW, your Upgrade and UpgradeVersion elements look reasonable to me. -Blair -----Original Message----- From: gapearce [mailto:mr_gapea...@yahoo.com] Sent: Friday, October 15, 2010 7:12 PM To: wix-users@lists.sourceforge.net Subject: Re: [WiX-users] SharedDllRefCount on Upgrade Gladly... here it is. Had to zip it... Thanks again for trying to help. http://windows-installer-xml-wix-toolset.687559.n2.nabble.com/file/n5641073/ full.zip full.zip -- View this message in context: http://windows-installer-xml-wix-toolset.687559.n2.nabble.com/SharedDllRefCo unt-on-Upgrade-tp5639450p5641073.html Sent from the wix-users mailing list archive at Nabble.com. ---------------------------------------------------------------------------- -- Download new Adobe(R) Flash(R) Builder(TM) 4 The new Adobe(R) Flex(R) 4 and Flash(R) Builder(TM) 4 (formerly Flex(R) Builder(TM)) enable the development of rich applications that run across multiple browsers and platforms. Download your free trials today! http://p.sf.net/sfu/adobe-dev2dev _______________________________________________ WiX-users mailing list WiX-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wix-users ------------------------------------------------------------------------------ Download new Adobe(R) Flash(R) Builder(TM) 4 The new Adobe(R) Flex(R) 4 and Flash(R) Builder(TM) 4 (formerly Flex(R) Builder(TM)) enable the development of rich applications that run across multiple browsers and platforms. Download your free trials today! http://p.sf.net/sfu/adobe-dev2dev _______________________________________________ WiX-users mailing list WiX-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wix-users