I also had this problem for at least 3 days,being totally unable to play but today i realized one thing. At the solutions Square Enix give us they say that you should go to msconfig and tick one thing there but that doesnt work.

But...,than i thought,why not try disabling some services,maybe one of them are blocking my game,and thats it.It worked.

You just need to disable everything that arent microsoft services,you can do that by ticking hide all microsoft services,and then disable one by one and then apply.Click OK and then it will ask you to restart,do it.

After that you will probably realize that your game is actually working .

To who doesnt know how to open msconfig, you just need to look for it at the search bar.

I thought that i need to share it,so reply if it work for you.