I always use below script to install my drivers from DVD or USB and Drivers folder is copy to the $OEM$ folder... everything working well with MBR file format legacy boot.. All drivers are install in Windows 10 after changing boot into UEFI mode with GPT file system... The drivers was copy to C:\Drivers same as the other windows 7 unattend and Win 10 Legacy boot MBR but drivers is not install... wonder who knows the trips? weird ....