Everything that is not realy needed. So windowstour, msn explorer, messenger (I use msn, and yahoo messenger) games, the stupid songs , wallpapers, themes (I put my own theme), screensavers, keybord languach that I will never speak. (I just keep French, Dutch and English) There's also one big component (44 Mb I think) that makes you install winXP when you are in XP. (you know, the splash screen when you put your xp cd in your pc while your still in XP) It lets older xp systems upgrade,... It has also the repair feature. But this repair stuf is not so good, and I never update, so I removed it. Also wordpad,... So I removed stuff. And now there is 330 mb still there. But the installation is much faster. 15 to 17 minutes. It will be longer if your harddrive still full, and big. The formatting part takes also time. (and that is not in my 15 minutes ) I never copy to my harddisk. I prefer to keep my install as clean as possible.