If you are trying to install IIS itself, Windows provides some facilities for doing this. On newer versions of Windows, such as Windows 2008 Server, it should be possible to install IIS by launching pkgmgr. On older versions, you may need to try using sysocmgr (note this may result in a prompt for the original Windows installation media).
A simpler and more recommended approach would be to require IIS be installed before your setup can be installed.
Thanks for the reply, BUt when I use the command using the answer file its asking for CD, should I inclusde the i386 folder and then proceed with the installation or how should i proceed
To the best of my knowledge, if IIS is not installed the person installing will need their windows installation CD. I am not aware of any seperately distributed installation for IIS. It is a windows component and as such would need to be installed from the installation media for Windows.
The reason for using prerequisites is to ensure the user has all software that is not part of your application, but is required by your application installed prior to installing your product.
