Executing MSI From Command Prompt

I could not install an upgrade from TechSmith for Camtasia Studio until I did so from the command prompt.   I have observed this behavior since I have installed Vista.  Double-clicking on the .msi file in windows explorer will start the process, but end abruptly with this nasty error message "Installation ended prematurely because of an error":


However, if I ran the same .msi from the command prompt, I get success.  Here is a screen-shot of what worked:


msiexec.exe /a camtasiaup.msi /passive

/a for administrative install
/passive for no screen prompts

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