When installing OCS 2007 R2 you receive the following error:
Failure [0xC3EC796C] One or more errors occurred during execution of the wizard; the wizard was unable to complete Successfully. Please check the log file for more information.
Failure [0x80070533] Logon failure: account currently disabled.
The Create Domain Service Account process fails when creating the DomainRTCGuestAccessUser
This can be caused by the delay in Active Directory replication. The setup wizard that creates the account is also using it, but is not waiting for replication to occur
Wait a few moments and try again