you sould give it as meny shots as it takes
Calibre is a truly remarkable program. (and have nothing to gain from you using it).
i am no expert, but here is what i would do:
1) uninstall calibre
2) delete the c:\profram files\calibre2 folder.
3) post a little more information (operating system, what vertion you downloaded ect.)
4) wait for the good folks around here (with more knowledge than me) to give you a better answer.
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