I got the same problem . after first reboot ,when GUI device scaning and installing, WatchDriverSigningPolicy.exe works good . but after 2er reboot , run keep driver step (ktd) , it doesn't work.. even i input a REG file to chang driver-sing check mode before ktd line Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\Software\Microsoft\Driver Signing] "Policy"=dword:00000000 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Driver Signing] "Policy"=hex:00 the error msg pops up too..... while i couldn'nt use unattened setup mode ,so i cann't add Unattended] DriverSigningPolicy= "Ignore" to winnt.sif