Install Trusted root certificate authority certificate via GPO

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http://serverfault.com – We have a Win2k8 as a Domain Controller in a domain with workstations that run Windows XP. I would like to be able to install via GPO a new trusted root certificate authority certificate that I've generated myself. I've created a GPO, imported the certificate in Computer Configuration\Windows Settings\Security Settings\Public Key Policies\Trusted Root Certificate Authorities and assign the GPO to a group of users. When I do a gpupdate /force on the workstation I can't see the certificate being imported ... even if I reboot the station. Next, thought that maybe I can do better if I create an (HowTos)