Sorry to hear about this experience. I would request you try rebooting your computer in Safe Mode (Windows) (macOS) and then relaunch Illustrator to check if it helps. If it works, there might be a third-party program interfering, and you might need to disable/uninstall it. You may try contacting your IT support for help with it.
Feel free to reach out if you need further assistance. We'd be happy to help.