Hi Bruce, sorry to hear about this problem. (1) Were there any major changes on your Windows PC that could be related to the problem? It would be good to know about that before advising next steps. (2) Could you take a look at this support article: [[Recover lost or missing Bookmarks]] (3) If no progress so far, are you seeing the error message mentioned in the following support article: [[Fix "The bookmarks and history system will not be functional" error message]]?