There is a whole portion of the MSI API dedicated to answering those 
questions. It is even automatable (available to script).

Chris Ridd wrote:
> Is there any good way of checking exactly what features and components
> of a package actually got installed by a user?
>
> I was expecting to find some evidence of their GUIDs in the registry
> somewhere, but none of them seem to be present despite things
> seemingly being installed.
>
> Cheers,
>
> Chris
>
> ------------------------------------------------------------------------------
> The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your
> production scanning environment may not be a perfect world - but thanks to
> Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700
> Series Scanner you'll get full speed at 300 dpi even with all image
> processing features enabled. http://p.sf.net/sfu/kodak-com
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>   

------------------------------------------------------------------------------
The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your
production scanning environment may not be a perfect world - but thanks to
Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700
Series Scanner you'll get full speed at 300 dpi even with all image 
processing features enabled. http://p.sf.net/sfu/kodak-com
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