Download the installation media from Microsoft, or use your supplied DVD media. I recommend you to apply the latest service pack 2 to the media files. Unfortunately, at this time of writing, there are no slipstreamed Service Pack 2 media, but you can follow this guide to make your own.
Start the setup.
Select Complete.
Select Create a new server farm.
Enter the database server name and the Database Access Account
Select the default values.
