Problem solved. :bigsmile:
Somehow I had over-looked the 'Troubleshooting' tips that are listed at the LightScribe Downloads site.
A reference to Microsoft Article 330135 concerning the AutoRun or AutoPlay Feature held the solution, in my case. The article contains steps to check the values of several keys in the registry. The one that solved my problem was "Resolution" Step 4: "Verify that the Restrict CD-ROM access to locally logged on user only option is not turned on.
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon value for allocatecdroms has to have the default value of 0 . LightScribe says this value must be 0, in their troubleshooting tips.
Given my paranoia about allowing software to run automatically from CD's or DVD's, I guess I did something in the past that changed the value to 1 instead of 0.
I made my first successful LightScribe label a while ago. After all the trouble, I don't know how many full-disc labels I'm going to be making - 28 minutes for one disc? :doh: