Regarding fatal error, there are a few things that you can troubleshoot:
1. Ensure that you are using the latest version of Quartus as there are a few bug fixed.
2. Please check that your machine system must meet minimum Hardware and Software Requirements. Ensure that your Operating System is supported. https://www.intel.com/content/www/us/en/docs/programmable/683472/current/system-requirements-and-prerequisite.html
3. Try restarting Quartus and your computer. This can help clear any temporary issues that may be causing the error.
4. Check your system resources, including memory, CPU usage, and disk space. Make sure you have enough available resources to run Quartus.
5. Try disabling any antivirus or firewall software temporarily, as they may be interfering with Quartus.
6. Run Quartus as administrator.
7. Install currprocess https://www.nirsoft.net/utils/cprocess.html and disable all the software running behind in the background.
Regards,
Richard Tan