To remove it<p>Firefox: Tools &#62; Options &#62; Advanced &#62; Encryption &#62; View Certificates &#62; Authorities &#62; find and delete the CNNIC entry<p>IE: Tools &#62; Internet Options &#62; Content &#62; Publishers &#62; Trusted Root Certification Authorities &#62; find and delete the CNNIC entry<p>Chrome: Wrench &#62; Options &#62; Under the Hood &#62; Manage Certificates &#62; Trusted Root Certification Authorities &#62; find and delete the CNNIC entry<p>Note, removing it from either Chrome or IE will remove it from both.<p>[Edit: added instructions for Chrome and IE]