SCCM 2012 - Optiplex 7040 Driver Deployment

Hi,

I am using the Windows 7 x64 Driver CAB in SCCM 2012 to deploy drivers to the optiplex 7040.

The "Apply Driver Package"  step is failing when trying to install the drivers, i receive the below error messages

DISM.LOG

CBS - Failed to unload offline registry ntuser.dat ACCESSDENIED

Unfortunately it doesnt give me details of the driver that is failing, otherwise i could just package the driver and apply it as a package.

All other builds are deploying fine so its definitely something thats only affecting the dell model, am using a 64 bit boot image already.

anyone seen this before?

I've seen some other posts which mention to use a 64 bit boot image which i already am, and this boot image works fine on all other hardware models.

thanks