Marcbrz

I've already download updates files, how I can get only new updates after my first one. I note that some folder (two) are in yellow and others in green, I need to download only in yellow? I need to download all files again? Can't understand that. What the difference between windows-xp-x86-enu and windows-xp-sp2-x86-ene? After a clean install with SP 2 and SP 3 I need to download what .ulz? I case to need this two I must download both to the same folder? Tks for help