Hi Roy,
Thank you. I backed up my Registry (as an extra precaution) and I created a Restore Point before trying the MS fix. It didn't help. It did say, however, that it repaired corrupted files in the Registry, though. I see that fix is for program install/uninstall, whereas I need help specifically with the Windows Installer Service program. It's the program that runs the updates for installed programs that ask for an update.
Ivan