I could login and play FFXIV before the update just fine. I downloaded the update yesterday and now get the following:

Failed to launch Final Fantasy XIV
Error Code: 216

This version of ffxivgame.exe is not compatible with the version of Windows you're running. Check your computer's system information to see whether you need a x86(32-bit) or x64(64-bit) version of the program and then contact the software publisher.

I'm a little confused as to why the update would render my computer unable to play the game. It's supposed to improve things isn't it?