You have hit one of Fritzing's bugs.
kill corrupt files:
There are two user directories (with your parts and the parts database) which don't get touched during an install (to not affect your sketchs during upgrades). On Windows they are in
(which is a hidden directory so you need to enable hidden directories in explorer) and
(where username is your windows id)
If you don't have any parts or sketches you want to keep you can just delete those two directories and Fritzing will receate them, or you can move them aside by renaming them if you wan to keep something in them. You can move them back in later and Fritzing will happily use them again (if for instance you need to export custom parts or sketches).
Edir: for a less drastic solution you can also try deleting all files of the
c:\Users\username\My Documents\Fritzing\parts\user ( the fpz file)
(an svg file) then icon. pcb and schematic replacing the breadboard above. Those are the files it has failed to delete and is now complaining about.