Error starting IPSEC service

I am trying to configure my laptop to tunnel to our
Netgear FVL328. After setting up the policy, when I go
to start the IPSEC Service I get the following error:

Could not start IPSEC Services service on Local Computer

Error 10048: Only one usage of each socket address
(protocol/network address/port) is normally permitted.

Consequently, when I go to establish (assign) the tunnel,
I get a message the it is assigned, but that the IPSEC
service is not running. Any ideas as to what is causing
this?