Be for you can Deploy SQL2008R2 Silently you have to create a Configuration File
For that you go to you installation Medium like The DVD or the place where you stored all files and double-click on setup.exe
You follow the installation right to the point when it is ready to install. Here you will find the path to the ConfigurationFile.ini save this file.
Cancel the Installation and open the ConfigurationFile.ini
You can now edit the file for your needs. To know what you can do where you can start the setup.exe from the command prompt with the command line parameter /?
For installing SQL 2008 R2 you need the MS Installer 4.5 too if it is not already on your system.
To install it silently you use following line:
SQL2008R2DVDWindows_installer_4.05WindowsXP-KB942288-v3-x86.exe /quiet /norestart
if you like to get a log file you use following line:
SQL2008R2DVDWindows_installer_4.05WindowsXP-KB942288-v3-x86.exe /quiet /norestart /log:"PATHAPPTITLE.log"
after you have done this you start your SQL installation with following line:
SQL2008R2DVDsetup.exe /IAcceptSQLServerLicensTerms=True /ConfigurationFile=PATHConfigurationFile.ini
now just wait until it’s done