How do I enable IPSec on a machine?

Right click on 'My Network Places' and select Properties

Right click on 'Local Area Connection' and select Properties

Select 'Internet Protocol (TCP/IP)' and click Properties

Click the Advanced button

Select the Options tab

Select 'IP security' and click Properties

Check the 'Use this IP security policy:' and select a policy to use:
- Client (Respond Only) - It will only use IPSec if asked to by the other end of a session
- Secure Server (Require Security) - All IP traffic requires security using Kerberos trust
- Server (Require Security) - Use IP security if possible
Click here to view image

Click OK to all dialogs