We're sorry about the trouble with Lightroom. Would you mind sharing the version of Lightroom you are using along with your computers operating system?
Have you tried to uninstall and re-install Lightroom to check if that helps? You can try resetting the preferences of Lightroom by pressing and holding the Shift + Option + Delete keys (on Mac) or Shift + Alt keys (on Windows). While holding down the keys, launch Lightroom.