I downloaded the CTP 1 for Denali as soon as it was announced. And also blogged about download resources and new features. When i extracted the package and tried to run setup, it produced following error on Windows Server 2003.
As a result i followed the provided link on message box. This page provides rich information about OS and components requirements for Denali installation.
After going through the page i came to know that Denali CTP1 would not run on Windows Server 2003. There are many other requirements but primarily i have to configure a windows server 2008 platform for installation of Denali CTP1.