Follow the screen shot to install Windows 2008 Server Windows 2008 Installation
Select you Language, time and currency format
Type in your product key, if it's a evaluation version click "Next" then "NO"
Select the edition of Windows server to install
Accept the license terms
Select the custom installation if its a new installation, if you are upgrading the version, please select "Upgrade"
Select the disk space where you want to install windows server, the installation is going to wipe out all the data's in the hard drive
The installation will take a while and restarts itself to finish
Once the installation is complete, it will prompt you to change the password
Once you change the password you will be able to log into the server, you will get a welcome screen with initial configuration to complete.