FFXIV Freezes up PC. Please help.

FFXIV Freezes up PC. Please help.
FFXIV freezes up my pc completely but the music on whatever area i am in loops as it should. I cannot exit out of ffxiv when this happens. Even in windowed mode my computer is still locked up. I can move the mouse but can click nothing. Only way to move past this is to unplug power. Please help