[renzii]

Originally Posted by kovidgoyal

Switch to the 64bit version of calibre. Uninstall calibre and install it again from http://calibre-ebook.com/download_windows64

I am actually running 64 bit version now, but I'm desperate and I'll try anything. Is there someway I can preserve my library during the un-installation?

PS Thank you everyone, but especially Kovid for all your help. Those online subscription services should take tips from how responsive and helpful, as well as knowledgeable, this community is!