Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums. I apologize for the delay in our response.

Have the crashes changed since you posted this? Are you able to log into any character, or does it crash right after logging in?

When you reinstalled the game, did you remove the locally-saved data folder (located My Documents > My Games > Final Fantasy XIV)? If not, try moving this out of the 'My Games' folder. Be sure to make a backup of this just in case it doesn't resolve the issue.

Double-check that your anti-virus/firewall has the appropriate exceptions for the install folder and the locally-saved data folder.

Is any part of your PC overclocked? Is any part overheating?

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!