@
Torontokp It sounds like you don't have (have lost) read/write access to the Calibre library folder.
It seems to happen on
some Windows 8 installations, but most often with the Temp location, rather than the Library. This might help
http://manual.calibre-ebook.com/faq....ror-on-windows - try resetting the ACL on the Library folder
But can you try something before you fix the ACL's. Using File Manager try to copy some arbitrary file into one of the existing book folders in a Calibre Library, if that works try to create an "Dummy Author" in the Calibre Library and within it a "Dummy Book" folder.
Then 'undo' what you just did.
If that all works then it begs the question - why can't calibre do the same thing?
Is your Windows 8 an upgrade from 7, a factory/dealer install or did you install to a blank system from a Retail Windows 8 DVD.
I've installed Calibre on a dozen or so Win 8 systems, and none of the users have experienced these issues. But in each case I also installed Windows Retail onto a freshly partitioned and formatted drive.
BR