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library addict - close calibre, go into the install folder, should be Programs Files\Calibre2 if 64 bit, Programs Files (X86)\Calibre2 if 32 bit or Calibre Portable\Calibre if portable.
Do you see a file named ebook-edit.exe?
If so double click on it,
Does the editor start?
If not what does it do ?
If it does start then close it
why wont it start from calibre (rhetorical)
copy an epub from the library to your desktop
drag the epub on your desktop over to ebook-edit.exe and drop it
does it read the book and can you edit it
if you can then
close the editor
now drag an epub out of your library and drop it on ebook-edit.exe
does it read the book and can you edit it
So how far did you get ?
BR