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Using IE click on the StartCom certificate logo, or you can download the cert and double click on it.

* Click "Open" on the security warning box.

* Click "Install Certificate..."

* Click "Next >"

* Choose the radio button for "Place all certificates in the following store", then click "Browse"

* Choose "Trusted Root Certification Authorities", then click "OK"

* Click "Next >"

* Click "Finish"

* There might be a warning, which you should approve.