Thanks Sandy for your concern. I tried to provide all needed info and I guess I failed to state the exact problem. Actually, I think I have figured out why the problem exists and maybe how to solve it. But I wish for your comments.
When I run the Discovery Report for the setup, it tells me that IS is part of the Developer edition (that's good). But it also shows that IS is not part of any Instance (as opposed to Analysis Services and Reporting Services, which are part of the MSSQLSERVER instance). That might mean that IS is in a shared group. (I'm not too knowledgeable on some parts of SQL Server.) I don't know if that is good or bad.
The problem I am having is that I get an error message (saying that IS needs to be installed) even though IS seems to be installed already. I think the problem is that when I installed the Express Edition, IS (a "hollow" version) showed up as if it were a part of the total software package. When I tried to run IS in the Express version, I got the message about IS needing to be installed. I searched the internet and found someone's wonderful post that said that IS really is not loaded with Express (and that Microsoft really should not even show the little icon on the screen). That prompted me to check more. I then found out that I could buy the Developer edition for $50. I bought it and loaded it to my PC.
I think that when the Developer edition loaded, it saw a version of IS (the "hollow" version) and did not reload IS from the Dev CD. Now, when I try to run IS, I think the hollow version is being invoked, and that version is connected to Express (and therefore, will not run).
When I tried to repair the Dev. version, I was unable to select IS, and so, nothing changed.
I think my solution is to drop Express and then see if I can add IS to Dev. version. If that works, I can re-download Express and move forward. If that doesn't work, I will have to drop Dev. and start all over by doing a new install of Dev. That should load IS properly. Then I can re-download Express. If I have any trouble at that point, I will drop Express permanently.
Does this sound like a good plan to you? Any comments are welcomed. Thanks.