So it crashes when you log in to a new user account too?

If so download Font Finagler and clear all font caches first.

If that doesn't work you may have a bad font in Library/Fonts. Move all fonts out of it to a folder and try again. Not System/Library/Fonts! It has fonts you need to rum the system. That should be reserved for the basic System fonts, unless you've moved fonts into it there should only be around 40 or so fonts by default.