I am kind of stuck. I have a huge collection of ebooks, and while I enjoyed using calibre, for some reason it's locking up and not letting me import/convert files. I don't know why, but since I upgraded to the latest version it just loads a few files and then locks up.

I lost my library when I reinstalled windows, and the program installs fine, but when I try to import my books it just quits. Kind of annoying.
I am wondering if there is another bulk converter out there that will handle lit, txt and rtf/doc files? I am still looking for a good pdf converter program, so I am open to suggestions on that as well
I tried looking around a bit, but I am not having much luck. I would rather have an "all in one" program to make the various lrf files and save them to my pc rather than a few various utilities.
Any helps appreciated.