I thank everyone for their input on my captioned problem.
As I indicated in one of my earlier replies to myself, for me, this problem is closed now. Microsoft Support accepted my MS Streets & Trips w/ GPS for a full refund. At least, the support staff I spoke to acknowledged that ST2011 was known to be incompatible with W7P SP1 and they offered the full refund.
A number of the replies I received offered possible solutions that I had tried and said so in previous updates to this thread (e.g., running the install from the data.msi on the install CD). While I still had possession of the ST2011 software, I was not made aware of the Microsoft reset tool mentioned by Mike L. Robbins so I can't say whether that would get me through my installation problems. So be it, everything was send back to Microsoft.
I can only hope that if Microsoft releases Streets & Trips 2012 that is does not inherit the problems I experienced. I consider this thread to be closed now. Thank you all.
Certainly continue to reply to this topic if others might benefit from your proposed solutions to ST2011 installs.