Thanks for both suggestions, Rimmer and jgweed.
I ran ScanDisk (actually Chkdsk) with no problems found by it. I uninstalled TweakDun, cleaned the registry using RegistryFix to get rid of any leftover references to TD, then installed TweakDun again. Again I got exactly the same results. . . . However!!!!
By trial and error I found that if I limited TD's importation of my Favorites folder to one subfolder at a time (e.g., Movies, Maps, etc.), that it works
So, I don't know what the probem was (maybe a bad item in the Favorites folder or at 889 entries it was just too large), but I believe the problem has been solved. Thanks for your help!
Edited by Frank D, 05 June 2005 - 03:58 PM.