Every time I tried to start Windows Installer I would receive the above error message. I ended up browsing to C:\Windows\System32, changing the sort order to alphabetical and locating msiexec.exe. Right above the exe will be another file named msiexec with no extension & 0kb in size. Delete this file, The Window Installer service will now start.
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Solved Windows Installer Service Start Error 193: 0xc1
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