Not able to use the group policy in windows server 2008

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http://serverfault.com – Currently I'm not able to use the group policy. Error Message: "To manage group policy you must log on to the computer using a domain user account" There is no domain attached to this windows server. Although I've tried to create a forest but it does not work as well. I do not see the options of ADS in the system. Am I doing it in wrong way. (HowTos)