I don't recall having to do it in Vista, but if I add a component to Windows 7 (e.g. IIS) do I need to reapply SP1?
migrated from stackoverflow.com May 19 '11 at 9:53
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No. SP1 should only need to be applied once.
Starting with Vista, the architecture of Windows is different than that of XP. All features/components are in the code base already, so when SP1 is applied to Windows 7, it updates that code base. Turning on or turning off Windows features does not actually add/remove it from your hard disk. http://windows.microsoft.com/en-US/windows-vista/Turn-Windows-features-on-or-off