>>
>>Sure, you always can add features to your installation.
>
>Thank you. A couple of more questions, if you don't mind.
>
>On the page Server Configuration, in the SQL Server Agent the choice is MANUAL. When I click on Next I get
>"The credentials you provided for the SQL Server Agent are invalid. To continue provide valid account and password ..."
>
>There is a button on this page that says "Use the same account for all SQL Server services". When I click on it I am prompted to enter Account Name and Password. Must I specify these? If so, where will these settings, Account Name and Password be stored?
>Or can I use Windows Authentication?

These credentials are for services.
You should use something like:
NT AUTORITY\NETWORK...
NT AUTORITY\LOCAL...