The likely answer is a corrupted parts data base. I'd try deleting the parts data bases (a install won't touch them) and retry. Note that it will connect to github and update that parts database, and if you interrupt that it will often corrupt the parts database. Note this will delete any parts or sketches that you have so make a copy of them or the directories before
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
c:\users\username\AppData\Fritzing\roaming\Fritzing (which is a hidden directory so you need to enable hidden directories in explorer) and
c:\Users\username\My Documents\Fritzing (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.