Is this a new installation or was it previously working and now doesn’t? The first (and least destructive) thing I would try is reinstall the Fritzing program from the zip file as this looks like some piece of code may be corrupted. After you do that, you need to wait (for possibly quite a while) while the parts database gets updated, during this process Fritzing appears to hang but if you interrupt it, then the parts data base will get corrupted and you need to try the next thing (which is destructive so make sure you have a backup first if you have sketches in Friting!):
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.