Ok, I think I might not have been clear enough. Prior to launching the PE, you should be able to add this code: [Default.AddReg] 0x4,"Software\Microsoft\Driver Signing","Policy",0x0 [Software.AddReg] 0x3,"Microsoft\Windows\CurrentVersion\Setup","PrivateHash",22,9e,53,3e,5d,08,ab,c8,77,1d,b9,d0,e6,06,a8,06 To a file and then build PE. You should now be able to have an unsigned driver load w/o error messages.