Excuse me if I'm asking very basic question but... I read your Reme file, the part below. Steps 1) Install WAIK on a Windows system. OSPM build uses Vista. 2) Copy OSPM build environment to c:\bld 3) Start a WinPE 2.0 Shell (Start->All Prorams->Microsoft Windows AIK->Windpws PETools Command Prompt) On 1), what do you mean by "OSPM build uses Vista." ?