Thank you for the update Rhomagus.

When you reinstalled the game, did you remove the locally-saved data folder (located My Documents > My Games > Final Fantasy XIV)?

If this does not work, you may want to 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.

As mentioned above, if your PC is restarting, it may be something hardware related. Can you see if any part of your PC is overheating?

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