Hello. I ran into the same issue myself yesterday. I saw your post and just changed the following below, after the OS installed. Is there a way that you can insert some sort of command or batch file to change the registry settings to the ones below when you set up the winnt.sif?? After i made this change everything now defaults to D: . Only thing i have in C: is the windows folder, I386, and the AMD64 folder. Why do i have the AMD64 folder on C:\?? don't know lol just though i would place it in there. CommonFilesDir REG_SZ D:\Program Files\Common Files CommonFilesDir (86) REG_SZ D:\Program Files(86)\Common ProgramFilesDir REG_SZ D:\Program Files(x86) ProgramFilesDir (x86) REG_SZ D:\Program Files