Contrary to what you read in the Readme file, you DO NOT have to uninstall Visual Studio.Net 2005 Beta 2 in order to install SQL Server 2005 JUNE CTP.
Just use the Buld Uninstall wizard ( "sqlbuw.exe") from the Tools subfolder to remove your previous beta. Then UNINSTALL .NET Framework 2.0, and
Install the .NET Framework 2.0 from the \Redist\2.0 subfolder. Then the regular Setup.exe from the JUNE 2005 CTP for SQL Server 2005 Enterprise will work perfectly!