Uh oh, when you uninstalled, did you choose to remove all your personal information? If so, do you have any backups of your system? There is a chance that Windows saved a copy of your places.sqlite database, or the bookmarkbackups folder, at some point, as part of a restore point, e.g., when you did Windows updates. I'm not sure how to search that, however. I did find a tutorial for a third party tool: [http://www.sevenforums.com/tutorials/193282-system-restore-points-manually-extract-files-folders.html System Restore Points - Manually Extract Files and Folders - Windows 7 Help Forums]. If you try it, you are looking for a folder similar to: C:\Users\''oldusername''\AppData\Roaming\Mozilla\Firefox\Profiles\ Rescue everything you find there so we can try mining it for useful stuff.

You can try an undelete utility like Recuva. *Recuva: http://www.piriform.com/recuva *https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox *http://kb.mozillazine.org/Profile_folder_-_Firefox