OK. First things first. That path to the executable box should have a /V switch after the msiexec.exe. Is it missing?
Is this the error you are getting?
Secondly, download this Windows Installer Cleanup Utility and install it. But be careful how you use this thing. It only removes registry entries for programs that you have uninstalled or no longer have. Be sure that you don't pick any programs that you still have or you may have problems reinstalling or uninstalling them.
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