Davey,
Thanks for your quick response! In fact, I have found a work around.
When I said "I tried everything", I meant a lot. Just not enough.
First I tried various combinations of using CCleaner,including check User Assist History, running, unchecking and running, etc.
Next I checked to make sure the setting of the number to retain had not been set to zero. It had not.
I also found some post at http://www.technologyquestions.com/technol...d-programs.html about certain registry keys to disable. Those keys were not present, so no help there.
The problem definitely was surviving rebooting. That is, the list did not repopulate after a reboot.
I decided to change the number of programs to remember. After doing that, the list did start to repopulate. So for me that is the workaround.