can I rename windows domain controller TLD
It sounds like you have a single-label domain name.
You have a couple of choices here:
-
Rename your domain with
rendom.exe -
Migrate to a new domain
The best option is probably the second one. SharePoint, Exchange, and the System Center products don't take kindly to being in a domain that's renamed. Grab a copy of the Active Directory Migration Toolkit. It will let you move users, computers, and groups into a new domain that is named properly.
At the risk of shamelessly self-promoting myself, it would seem like you should read my blog post about how to properly name your Active Directory.