Thank you for the update Tinyo02.

Try some of the following and see if it has any affect on the error:

-Update/reinstall Graphics card drivers
-Disable all programs/overlays running in the background
-Set compatibility mode to Windows 7 (right click on the exe file and select ‘Properties.’ Then select the ‘Compatibility’ tab and choose Windows 7)
-Make sure that any anti-virus software they have has the appropriate exceptions
-Install game on C drive (The same drive as the Operating System)
-Try a clean boot. Simply open the task manager and select the 'Start up' Tab. Disable everything here and restart the PC.

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