SQL SERVER 2005 SP3 Install Fails with Error 1612: Unable to install Windows Installer MSP file - Mi

Hi I have an Issue..... I am having SQL SERVER 2005 (RTM), which is a production Server, Now we would like to apply SP3 on this server where while applying the SP3 we are unable to find Database Enine to apply. But we can see rest of the futures like MS .

blogs.msdn.com