After upgrading through the App Store last night, I woke up to Finder Quit Unexpectedly errors this morning. Nothing seemed to work and it would go into error again no matter I did. I booted into Recovery Mode with Command-R and ran Disk Utility on the hard drive. One error came up with invalid directory count (35 instead of 34), but it seemed to fix that and had an exit code of 0. Restarted and the same Finder error occurs. Trying now to boot into safe mode (shift), but it seems to be taking forever to start up (finger getting numb) and the progress bar about 90%. I have a Time Machine Back-up that is current and a carbon copy about two weeks ago. Can I re-install 10.12.3 from the recovery Partition? Or, what would be the fastest way?