Final Fantasy XIV Crashing Perpetually

Cannot seem to log into the game, Final Fantasy XIV has stopped working is the message it displays.

Problem signature:
Problem Event Name: APPCRASH
Application Name: ffxivgame.exe
Application Version: 1.0.0.0
Application Timestamp: 4e49f09a
Fault Module Name: ffxivgame.exe
Fault Module Version: 1.0.0.0
Fault Module Timestamp: 4e49f09a
Exception Code: c0000005
Exception Offset: 005dcdd5
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

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Graphics card is Radeon 6870.
12 gb of dual channel ram.
3.4 ghz Sandy bridge i7 processor 2600.

Loads on my Lindblum character no problem, class pugilist.
Does not load at all on my Mysidia character, changed to conjurer.

Greetings, Reiokyu!
Thank you for posting your concerns about your game crashing. Just to make sure that your report gets the proper attention, I have made sure to move your thread from "In-Game Bugs" to "Technical Support." I hope everything goes well for you. Thanks again for your participation, and good luck!