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

Try a clean boot of the PC, simply go to the task manager, click the start up tab and disable everything, then restart the PC. Make sure that you don't have any other programs running in the background.

You can also try reinstalling, however, save this for last as it is the most time consuming.

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