While installing SQL Server 2008 R2 on my computer yesterday I faced an error, detail text of error message was:
Rule “SQL Server 2005 Express tools” failed.
the SQL Server 2005 Express Tools are installed. To continue, remove the SQL Server 2005 Express Tools.
I had Windows 7 in my computer and SQL Server 2005 Express with SQL Server Management Studio was already installed on it. I found solution in blog of Anthony Stevens (http://thepursuitofalife.com/sql-server-2008-installation-error-remove-sql-express-tools/) where he says to uninstalled SQL Server Management Studio before installing SQL Server 2008. I did the same error was removed.