If the above advice doesn't work download a free tool from microsoft called "process monitor".
It will show you all the file and registry reads and writes from each process.
It will produce a huge amount of information, but create filters to only show activity of the setup program, and somewhere in there you'll find what its reading that you need to delete.
Careful you don't delete the wrong thing. You'll be staggered how much stuff there is going on that it picks up
HTH
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When you pull the pin from Mr. Grenade, he is no longer your friend.
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