I have captured and deployed a windows 7 image and fog has been adding the machines to the domain. FOG uses the netdom.exe file. To get the netdom file:
Install the Remote Server Administration Tools (RSAT).
Go to Control Panel -> Programs and Features -> Turn Windows features on or off
In the treeview, go to Remote Server Administration Tools -> Role Administration Tools -> AD DS and AD LDS Tools and select AD DS Tools. Click OK.
Netdom will now be located in C:\Windows\System32. You will need to change the path to netdom in the config.ini file in the C:\Program Files\FOG\etc folder to point to C:\Windows\System32\netdom.exe