Thanks for fast reply!
The first time i install Calibre i tried to make a new folder i called "my e-books" on my desktop. When I deleted Calibre and installed it again "My documents" was highlighted so I tought that was a default folder for my e-books. But I later
tried the folder witch Calibre made, Calibre-library. But that wont work either.
Sorry for my poor english and bad translations, but I run a Norwegian OS.