In an effort to update my inherited and grossly out-of-date environment so that I could eventually installed Ex2013, I attempted to apply Exchange 2007 SP3 on my single Exchange 2007 SP1 (no rollups) server running on Server 2003. All steps were fine until It failed with:
[10/3/2015 11:18:14 PM]  Setup will run the task 'uninstall-msipackage'
[10/3/2015 11:18:14 PM]  Setup launched task 'uninstall-msipackage -logfile 'C:\ExchangeSetupLogs\ExchangeSetup.msilog' -ProductCode '24b2c164-de66-44fe-b468-a46d9d5e6b31' -PropertyValues 'BYPASS_CONFIGURED_CHECK=1 DEFAULTLANGUAGENAME=ENU''
[10/3/2015 11:18:14 PM]  Beginning processing.
[10/3/2015 11:18:14 PM]  Property 'PackageName' is 'EXCHANGESERVER.msi'.
[10/3/2015 11:18:14 PM]  Removing MSI package with code '24b2c164-de66-44fe-b468-a46d9d5e6b31'.
[10/3/2015 11:25:48 PM]  [ERROR] Unexpected Error
[10/3/2015 11:25:48 PM]  [ERROR] Unable to remove product with code 24b2c164-de66-44fe-b468-a46d9d5e6b31. Fatal error during installation. Error code is 1603. Last error reported by the .msi package is 'The Windows Installer Service could not be accessed. This can occur if you are running Windows in safe mode, or if the Windows Installer is not correctly installed. Contact your support personnel for assistance.'.
[10/3/2015 11:25:48 PM]  [ERROR] Fatal error during installation
[10/3/2015 11:25:48 PM]  Ending processing.
[10/3/2015 11:58:48 PM]  End of Setup
If I'm reading this correctly, it failed while trying to uninstall the prior SP1. A search for EXCHANGESERVER.MSI turned up nothing. No idea why it wouldn't be in C:\Windows\Installer. So I could put that SP1 file there, but I'm not sure if that is correct solution. I'd like confirmation on that. I don't believe there is a problem with Windows Installer as there were many, many files uninstalled successfully during the upgrade until it failed.
I have not restarted the server, have not restored any files from the backup I made of C:\Program Files\Microsoft\Microsoft Exchange, and I have not attempted to restart or enable/restart any of those disabled Exchange services.
I did enable/start HTTP SSL, IIS Admin, and WWW so I could restart the SP3 install. I now get the error that the binary files are not present and only build-to-build upgrade mode is available.
So now I'm screwed I think. I have no idea where to go as I can't restart the SP3 installed as all relevant services are now disabled. I'd be happy to get Exchange up and running prior to my upgrade attempt but ultimately I would love SP3 with the latest rollup.
Any and all help would be tremendously appreciated.