Just wanted to add that I as well am getting this like crazy (as well as error 90K *sigh*) and it is so dam frustrating not knowing if its my PC or if its something on SE's end. For me i can log in fine and it usually works for a little then out of no where the game will freeze for about 5 seconds then the "has stopped working" windows 7 error will appear.


Log Name: Application
Source: Application Error
Date: 08/09/2013 14:04:26
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: Batcomputer
Description:
Faulting application name: ffxiv.exe, version: 1.0.0.0, time stamp: 0x522639d7
Faulting module name: ffxiv.exe, version: 1.0.0.0, time stamp: 0x522639d7
Exception code: 0x40000015
Fault offset: 0x0085eb81
Faulting process id: 0x11bc
Faulting application start time: 0x01ceac8d4109dfec
Faulting application path: C:\Program Files\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\game\ffxiv.exe
Faulting module path: C:\Program Files\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\game\ffxiv.exe
Report Id: 2ffcaede-1887-11e3-ac9b-00161798d2fc
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2013-09-08T13:04:26.000000000Z" />
<EventRecordID>12611</EventRecordID>
<Channel>Application</Channel>
<Computer>Batcomputer</Computer>
<Security />
</System>
<EventData>
<Data>ffxiv.exe</Data>
<Data>1.0.0.0</Data>
<Data>522639d7</Data>
<Data>ffxiv.exe</Data>
<Data>1.0.0.0</Data>
<Data>522639d7</Data>
<Data>40000015</Data>
<Data>0085eb81</Data>
<Data>11bc</Data>
<Data>01ceac8d4109dfec</Data>
<Data>C:\Program Files\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\game\ffxiv.exe</Data>
<Data>C:\Program Files\SquareEnix\FINAL FANTASY XIV - A Realm Reborn\game\ffxiv.exe</Data>
<Data>2ffcaede-1887-11e3-ac9b-00161798d2fc</Data>
</EventData>
</Event>

Many more like that but I'll save you the webpage space. Just as a last point before the last update (4th September was it) I did not have this issue at all, its only afterwards that this has hit, could do 8 hour sessions with no problem.