Thank you for the multiple suggestions.
I tried disabling UAC based on your suggestion. I had been restarting the PC between attempts to start the launcher.exe, so it effectively executed the suggestion number 2 Tried based on your suggestion but the launcher.exe exhibited the same old behavior (it is in the Task Manager processes list, but did not do anything) Based on your suggestion I tried this: Chose a different folder as destination for repair utility. The launcher came up (along with something called BitRaider(!)), quickly expanded some files and started downloading what seemed like the whole game; so, I cancelled it. Tried repair utility again and chose the same folder as the original game folder; it quickly expanded some files but the launcher.exe exhibited the same old behavior (it is in the Task Manager processes list, but did not do anything)
When none of the above worked, I uninstalled the game and reinstalled from the original Amazon DVDs. It went through smoothly. Now the (old) launcher comes up but when I enter the email and password, it says "Server not responding."