SQL Server 2008 RC 0 Setup shows the following error messages when try to install.
To over come this problem follow me..
Just go here
C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA
you will find here some files
ReportServer.mdf
ReportServer_log.LDF
ReportServerTempDB.mdf
ReportServerTempDB_log.LDF
Just Remove these files and rerun your installation n Enjoy SQL Server 2008.