I can open the launcher, press play, then the game starts, loads 90% of the way, then stops responding. I've uninstalled and reinstalled, I've restarted several times, and nothing is working. It's unmodded as well.
Malwarebytes ADWCleaner is a utility to clean a PC which is infested with malware. Download it here: https://downloads.malwarebytes.com/file/adwcleaner
Run it, click Scan Now, once it completes the scan click Clean & Repair, restart the computer when it asks you to