Solved: Hi thank you all so much for your replies. Not fussed because I don't imagine using anything else to manage my library. epubs when I uninstalled it but that is a separate issue for later. PS: It would have also been nice if it removed the links to. Anyone have this issue before? I have a feeling there are some corrupted remnants somewhere else I need to get rid of that lets it reinstall. Tried to install both 32 and 64 bit versions (same issue) Deleted the calibre folder from roaming I also notice that even though it is (completely) uninstalled it still shows up as an option for opening files that were previously linked to it (obviously does not work, since uninstalled). I uninstalled it and tried to reinstall the newer version and got the same error. I tried installing a newer version (4.22 at that time) but it kept rolling back the installation and saying there was an error but nothing was modified.

Calibre servers to store and access books and reading books anywhere in the world by the browser, mobile, Kindle, etc.I used to have calibre but it was unresponsive when opening epubs from time to time.

Full support of content, bookmarks, CSS, a reference mode, printing, searching, copying and customization by style sheets and font rendering engine embeded.The ability to open a variety of books in any format.Ability to download news from three thousand News Agency (expandable) and convert them into e-book (allowing for the development of plug-in applications are possible).Format conversion engine is a powerful example detection seasons and different parts of the document, the possibility of adding metadata to book.You can convert a wide range of e-book formats to each other.Support for tagging books for improving the process of searching for books.Ability to sort books by title, author, publication date, etc.

Effective management of electronic books.

Calibre portable 4.23