1. Shut down Lotus Notes and kill any process related to lotus from Task Manager [Or use Killnotes app]
2. Find a file called bookmark.nsf. It will be located in one of these folders:
- C:\Program Files\Lotus\Notes\Data\
- C:\Program Files\IBM\Lotus\Notes\Data\
Rename bookmark.nsf to bookmark.old. Make sure that you do not rename bookmark.ntf file by mistake
3. Start Lotus Notes. It will recreate bookmark.nsf file using the template (bookmark.ntf).