I installed this thing a few weeks ago. It writes literally thousands of entries into your registry. If you use a registry cleaner like Norton, it sees these as being "orphaned" and wants to delete them, which in turn makes the editor crash. And when you uninstall the editor, it does not clean-up after itself.
Softimage could have done a much better job here - this thing acts like some kind of hack-job in-house software (can you say "Radiant"?), not a subset of a quality retail product.