Internet Explorer (IE)

Local

• Certificate, add one to the local trusted store

External

Subject

1. Run IE as admin
2. goto site with cert that you want to make trusted
3. click "Continue to this website (not recommended)
4. choose "No" to any more security warnings that appear
5. In IE's address bar, see near the end "Certificate Error"
6. Click on "Certificate Error" and then "View certificates"
7. Click on "Install Certifcate..."

Reference http://blogs.technet.com/sbs/archive/2007/04/10/installing-a-self-signed-certificate-as-a-trusted-root-ca-in-windows-vista.aspx