Thank you very much for the link. I appreciate the help. #1 and #2 didn't work so I gave the 3 options a try and got one step further. This time when I tried to launch Lightroom, I got a screen that said to sign in and after I signed in, it said Enjoy your product, then nothing after that. I think Lightroom is just not meant to become part of my workflow.
You might reboot and try the other Solution #1/2 items, again. Since you did so much hacking which may not have been related to the issue, there may be something else not right because of it.
You also might try uninstalling and reinstalling LR 5.5 from the cloud, again, or installing the LR 5.5 standalone update from the Adobe updates page: http://www.adobe.com/downloads/updates/
You also might try uninstalling your all Adobe software, running the CS Cleaner and installing, again:
You haven't said what other Adobe software you're running.
Is this the very first time you've tried to run LR on this computer or have you upgraded from previous versions that worked ok?
Your solution to download Lightroom from this link worked perfectly: http://www.adobe.com/downloads/updates/
I was able to start the download without getting the error message about the aam protocol not being associated with any program. I didn't have to mess around with the Adobe Application Manager aka Adobe Update Manager or rename the OOBE file. I simply downloaded the Lightroom setup program and ran it. It installed Lightroom without any problems and Lightroom now runs when I click the Lightroom icon.
Thank you so much - the help is greatly appreciated :-)