Your computer was joined to the domain using your computer old name because the following error has occurred. The directory service is busy.

To resolve this issue follow the given instructions.

1) Go to start menu and click on Run.

2) Type 'cmd' inside Run Window and click ok.

3) Command Prompt will open. Now write net use and Press Enter Button.

4) It will show all the shared drives. If there is any shared resource shown then first disconnect it.

5) After disconnecting the drives come back to Command Prompt and write net use */delete.

6) Now join it back to the domain and all the hurdles are gone.

I hope that this solution will help you as it resolve my issue.