WinPE 4.0

1. Download the Assessment and Deployment Kit (ADK) from MSDN subscribers download.

2. Install ADK by running adksetup.exe, and make sure that Windows Preinstallation Environment is selected (selected by default).

3. Open "Deployment and Image Tools Environment" as administrator. 

4. Type "copype amd64 C:\WinPE_amd64" to create folder.

5. Create C:\mount folder.
6. Type "dism /mount-wim /wimfile:C:\WinPE_amd64\media\sources\boot.wim /index:1 /mountdir:C:\mount" to mount wim file.

7. Type "dism /image:C:\WinPE_amd64\mount /add-driver /driver:C:\driver /recurse
dism /image:C:\mount /get-drivers" to add your drivers.
8. Type "dism /unmount-wim /mountdir:C:\mount /commit" to unmount wim file.
9. Type "MakeWinPEMedia /iso C:\WinPE_amd64 C:\WinPE_amd64\WinPE_amd64.iso" to make iso file.
10. Type "MakeWinPEMedia /ufd C:\WinPE_amd64 X:" to make WinPE bootable USB key.