Fan on Mac Book Air & Finder crash always
First thing I'd try is to remove the saved state - assuming you can get that far…

navigate to ~/Library/Saved Application State/com.apple.finder.savedState/
&amp; delete that entire folder content.

If you can't get far enough to do that, it can be done from single user at boot, but I'd need someone smarter than me to fill the details, so post a comment or revise your question if that's the case.