Ravi, in the release notes it states that you may have to manually removed the registry entry. Check the release notes/known issues for details. ...
[EDIT] From the release notes: To work around this issue, manually remove the registry key at HKLM\SOFTWARE\Microsoft\Microsoft SQL Server\80, and then re-run SQL Server 2008 June CTP Setup.
Personal Motto: Why push the envelope when you can just open it?
If you follow the direction given HERE
you'll likely increase the number and quality of responses you get to your question.Jason L. Selburg