Sorted it myself... The drivers in the HP Service Pack had the following structure: sp41498 sp41498\install sp41498\install\drivers There are drivers in the 'sp41498' and 'sp41498\install\drivers' folders. I had used the drivers from the 'sp41498\install\drivers' folder, of which DISM had picked up two drivers. However instead I've added the drivers from the 'sp41498' folder, it picked up four, I also added the drivers to both images, 1, and 2. Regards