Networks

I want to designing additional server 2003 for advanced server 2000. At First I updated schema master role on server 2000 and then DECPROMO, but when I run this action, I receive this error message :
"The operation failed because: The Active Directory Installation Wizard was unable to convert the computer account" to a domain controller account. "Access is denied."

For Resolve this Error I read Article 232070 but I Cannot Resolve it.