Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums.

You may want to try a clean boot. Simply open the task manager and select the 'Start up' tab. Disable everything here and restart the PC. Avoid opening any other unnecessary programs while running the game.

Also try setting the compatibility mode to Windows 7. Right click on the ffxivboot.exe file and select ‘Properties.’ Then select the ‘Compatibility’ tab and choose Windows 7.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!