Forgetting or Losing Windows server 2008 domain controller (DC) password is more complicated than local password. There are many ways can help you recover or reset windows local password, but little can help in Windows server 2008 DC password. When you are facing these problems, you will be mad if you deal with it in a wrong way. Then two tips on how to reset Windows Server 2008 domain password may help you a lot.
It's possible to reset your Windows Sever 2008 / R2 Domain Controller administrator password using your installation CD. See below.
Then your system Admin Password is reset. Please don't forget to rename back Utilman. Exe - > Cmd.exe and Utilman.exe.bak-> Utilman.exe after getting back access.
The first method is not easy for you to understand and operation. However, if you don't have an installation CD, it is better to find a windows password recovery software to solve your lost domain controller password problem. There is no need to worry about how to use it ,what's more, it save more time. Only a few minutes can get back into your server again.