Thanks Kelsenellenelvian. As I am writing this post now, my vista is installing. I, however, still got 1.3GB at the least. I followed the preset at at http://www.msfn.org/board/light-vLite-configs-t111149.html and still ended up with over 1GB ISO. I noticed that there is one component alone in the System that has 1.239GB in size i.e. Component Cache (winsxs). But it says that if I remove this component, the ISO size won't be reduced by much and it will remove Control Panel which of course I would like to have on my Vista installation. Please help. Cheers,