Hi Carlos,
I inject all drivers that came from DELL for the specific model, also the one that are not needed (as Example the Fingerprintreader)
I didn't check the dism log all the time. Maybe we get this errors too.
Where is the point that these errors are a problem for you?
Is the provisioning template stopping?
To your additional question.
Are non Windows 7 drivers not compatibel with dism? I did not tried it. We are working in a Windows7/8 Environment.
-> In this case I would only try to find a Windows 7 Network driver for the Model an the other drivers I would install via Softwarepackage and a HII Action in the System Configuration Section