After spending many hours creating Windows 7 X86 and x64 environments just adding all available updates to the install.wim and boot.wim, both environments get the CD/DVD Driver missing message. Since this is the first time i'm using WTK i'm not sure if the steps i used are correct or WTK is failing. The steps i used: 1) download all updates for x64 and x86 environment storing it to separate directories: updates\x64 and updates\x86 2) Unload the ISO image to separate directories : win7srcx64 and win7srcx86 3) in Basic AOI browse for win7srcx86\sources install.wim removed the starter, home basic and ultimate image - selected both remaining images (home premium and professional), used option (no preset) - added all updates and started the integration process. - It took nearly 4 hours to complete, closed the window, opened basic aoi, browsed for the boot.wim, selected both images (pe and professional) added all updates and started the integration process. here are not all updates incuded, many show the black x (not inserted). after the image was ready, i created the ISO image, burned it to dvd and tested with the known error (CD/DVD driver missing) The same procedure i used for the X64 environment. I'm not sure (didn't find it documentd) if the integration step to the boot.wim is requqired and if that could be a problem ?? Any help will be appreciated... thanks