Since you forced it closed the database now needs to be deleted manually and then you can restart and be patient while it downloads and installs parts updates. It takes a long time and gives no feedback. We know it was working because it corrupted the database.
There is a hidden Fritzing folder that has all of your parts in it along with your configuration files. I do not know where it is on Windows. Once you find it you can make a copy if you have added any parts manually and if not you can simply delete the entire thing. Then you just reinstall/start Fritzing and wait patiently, go for a coffee or watch a movie while you wait.