I must have really misunderstood something quite basic here.

I was under the impression that I could use MDT to build an unattended installation, and then install it onto a PC, and then customize that PC BEFORE I ran another Task Sequence to Sysprep and Capture.

But from your latest post, I'm getting the impression that I have to do *EVERYTHING* from the MDT, in one single Task Sequence. That would include software to be installed onto clients and drivers and everything.

Is this correct?

The NIC in question is an Intel 82577 Gigabit Adapter

almost - you *can* use two separate task sequences to build, customize, and capture - use one MDT task sequence to do the build, then customize as you desire, then *from that OS install* run the sysprep and capture task sequence. If you manually sysprep first, it won't work. However, given that MDT is a tool for repeatable builds, you probably want to find a way to get that customization into your first MDT task sequence, so that you *can* use just one task sequence for build, customize, and capture. That's the whole point of MDT, really.