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

I see you've already tried a few things that we would normally suggest. However, it doesn't look like you've tried a selective start up. Click Start, type msconfig.exe in the Start Search box, and then press Enter to start the System Configuration utility. On the General tab, click the Selective startup option, and then click to clear the Load startup items check box. On the Services tab, click to select the Hide all Microsoft services check box, and then click Disable all.

Also make sure that any anti-virus that you have has the proper exceptions for Final Fantasy XIV. If either of the two update, it might cause interference and issues like this one.

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