1. Login to Windows
Login to your windows server.
2. Launch the Exchange 2013 ISO
Open up the ISO file and let it extract to a folder.
3. Run the setup
Launch command prompt elevated and navigate to the extracted folder. run the command: setup /PrepareAD /Iacceptexchangeserverlicenseterms
4. Run the setup
Launch command prompt elevated and navigate to the extracted folder. run the command: setup /PrepareSchema /Iacceptexchangeserverlicenseterms