I want to clean-install Windows 7 on a laptop. The laptop is Dell and it has a COA sticker for Windows 7 Pro OEM. If I do a clean-install using the Dell reinstallation DVD, then after clean-install, windows is pre-activated. But the Dell reinstallation DVD doesn't have SP1. If I do a clean-install using an iso image with Windows 7 Enterprise with SP1 integrated, then after clean-install, windows is not pre-activated, and requires activation by phone. Is it possible and legal to modify win 7 enterprise sp1 iso so that it will be pre-activated after a clean-install only on a dell laptop with coa sticker ? It yes, then how can this be done, step by step, and does the procedure allow for integration of network drivers ?