IPSEC Services Problem

Local Security Settings > IP Security Policies on Local Computer
STATUS MESSAGE:
"Assigned, but the ‘IPSEC Services’ service is not in a running state."

Tried to start the service by entering Administrative Tools > Services
IPSec Services > Properties > ‘Start’

ERROR MESSAGE:
"Could not start the IPSEC Services service on Local Computer.
Error 1747: The authentication service is unknown."