Thank you for the information everyone.

Do all of you have a gaming mouse/keyboard? If so, make sure that the drivers for these are up to date.

You can try a clean boot. Simply open the task manager and select the 'Start up' Tab. Disable everything here and restart the PC.

If these do not work, try a full reinstallation of the game. Make sure to reinstall the files in the 'My Documents' folder as well.

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