I'm also getting this error. It occurs whenever I try to log in on a character (I get the 'now loading' screen, and then instead of logging in it gives me the "Final Fantasy XIV: A Realm Reborn has stopped working"). I also get this error whenever I try to make a new character, as soon as I start playing with the height slider bar, bam. Crash.

I've tried using the methods listed above to no avail, and I'm running the beta phase 4 client updated, if that helps. I had/have a legacy account.

My error details are as follows:
Problem Event Name: APPCRASH
Application Name: ffxiv.exe
Application Version: 1.0.0.0
Application Timestamp: 522639d7
Fault Module Name: ffxiv.exe
Fault Module Version: 1.0.0.0
Fault Module Timestamp: 522639d7
Exception Code: c0000005
Exception Offset: 00868684
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789