I recently did a clean installation of XP. After that I reinstalled Adobereader6 which I had used before. When I click on "File" ther is no 'bookshelf as before. On googling I found this--AdbeAcrobat/Reader6x (or greater) stores ebooks in a "Bookshelf". Your Bookshelf can be found as a menu item under the "File" menu, or as a button in the ADobeAcrobat tool bar. I cannot find any bookshelf under the file menu. But previously I did. What has happened? please help.