Windows Vista/7 (ALL) Retail/OEM (Dell, HP etc.) Rename Existing & Replace with backup files after reinstall Replace generic OEM ISOs \i386 files with newly created. C:\Windows\system32\Catroot\OEMBIOS.CAT.Old Method Create vendor specific OEM installer Install using any media that matches version, use Windows Key Update Tool to activate it as Retail or OEM based on key provided. GRTMPOEM_EN.iso (Generic Professional OEM).Windows XP (Home/Professional) OEM(SLP) (Dell, HP etc.) Looking for solid confirmation on how Windows(XP,Vista,7,8) OEM can be reinstalled/activated