Did you import the pfx by dbl click and then import using the import wizard? Could you remove all your root instances from all stores and try again? The easiest way to manage certificates on windows is by starting mmc and then add the certificates add-in. Using the mmc add-in you can search for a certificate by right clicking the top store element and then choose search for certificates. Search for your root and delete all references and try to import the pfx again
Kind regards
Martijn
--- sent from Blackberry