MDT 2010 won't capture Optiplex 990 - Missing network driver

I've been able to use MDT 2010 to deploy Windows 7 to an Optiplex 990 (wiping out all of the factory partitions first -- that's an issue for another thread) but I can't sysprep and capture the deployed OS. This happens only on the capture phase - after installing the OS and executing sysprep, the system reboots into a Windows PE RAM disk to capture the image of the installed OS. But after the reboot, there's no NIC driver (using the Intel NIC built into the motherboard), so the capture fails.

The Windows PE CD has the WinPE drivers (selection profile) and when the OS is deployed, the correct drivers are injected from the Optiplex 990 driver pack in the deployment share (using a selection profile for now), so the OS runs correctly as installed.

I suspect I need to add an Inject Drivers task step into the task sequence just before the reboot. Has anyone had this issue, and been able to solve it?