The wizard detected an existing computer account in Active Directory Domain Services (AD DS) for a writable domain controller ...

The wizard detected an existing computer account in Active Directory Domain Services (AD DS) for a writable domain controller that matches the name of this computer. If you install AD DS on this computer, this computer will become a writable domain controller and will use the existing computer account. If you do not want to use the existing computer account, you must rename and restart this computer before you install AD DS.

Do you want to continue and make this a writable domain controller using the existing account in AD DS?