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Thanks a lot for this guide. Only using your method I could install win7 on uefi class 3: the key to forcing a custom video driver at the installation of windows was to sign it with a selfmade certificate and then add the certificate to the registry of the installation. This way the video driver will be used at first boot, being able to complete the installation while you disable standard vga to ensure full compatibility with uefi. 1e1e36bf2d