This may sound odd, but for some reason Nautilus keeps crashing when trying to launch a window.
My first try to correct this, would be to completely erase the nautilius directory where all its settings are stored at. In order to do that you would have to type in a console:
And probably you would have to also erase:
rm -rf .gnome2/nautilus-scripts
Try that and then see if you can open a nautilus after you restart your session.