no, if you first integrate the RTM LPs into a DVD the Wave1 Installer updates the LP files correctly. But if you try to integrate the RTM LPs into a DVD it works, but there are a lot of untranslated parts of Vista. if you need a Sp1 Installation with a new LP to the steps : 1. integrate the LP 2. integrate the Wave1 Sp1 Installer 3. Remove useless stuff.