Further to my earlier post SQL Server Client Tools Setup Fails due to MSXML 6 , in which I mentioned a solution for SQL Server Client Tools setup failure, if you are still unable to install them then following steps may help you.
- Navigate to \Tools\Setup folder of your SQL Server Setup CD
- Launch SqlRun_Tools.msi
It will launch the installation wizard directly and in 90% percent of the cases you will be able to install the client tools successfuly.