Photoshop is sensitive to poorly constructed fonts, though Adobe keeps trying to make it more robust.
You need to go through your installed fonts and find the one or ones that are sending Photoshop into the weeds. I believe there's an Adobe article online on how to do so... Searching... Ah, here:
I know that Chris Cox of Adobe, who frequents this forum, would love to have a copy of whatever font is able to crash Photoshop. They may have already fixed the issue in CS6, but if they haven't, I'm sure every future Photoshop user would thank you for facilitating their making Photoshop more robust.
I will read through the link and see if that helps solve the problem