I had the same problem. A bit of investigation suggests that the cause is the WYSIWYG editor (TinyMCE), and that in turn is because some recent patches to IE have affected it somehow.
So the only solution at the moment, for IE, is to turn off the rich text editor if you are getting the crash, as there’s nothing you can do to stop it happening. Since it’s an IE/TinyMCE problem rather than WordPress, a long-term fix will have to come from one of those two camps.