1. Open cmd/command as admin user
2. cd C:\Program Files\Tenable\Nessus
3. net stop "Tenable Nessus"
4. nessusd -R
5. net start "Tenable Nessus"
sudo service nessusd stop
/opt/nessus/sbin/nessusd -R (20 minutes on mid-spec VM)
sudo service nessusd start