Please help me.....problem with windows 8

[Revoked]

I am playing on windows 8 with a laptop so it is not an inherent windows 8 issue. Initially windows blocked mine, so you might want to check your firewall as as well as the built-in windows one. You might also want to go into the events viewer and view critical events. Right click the lower left hand corner of the screen and it will bring up a menu where you can click events viewer. That should tell you what is failing.

I sometimes get a driver kernel error for my nvdia when playing that gives me the same 'ffxiv has stopped working' message, but it is rare enough that the game is playable.
whoops, posted after you had obviously done these things. Nvm lol.