WinPE fails every time after "preparing network connections" message during Build & Capture task sequence

Question

Sorry, I'm using SCCM 2012 but can't find a forum for that ANYWHERE, so I'm posting this here:
We're making our first attempt at OSD (build & capture) on an out-of-the box Dell Optiplex 9010 all-in-one. I've injected the NIC drivers found
here on Dell's Enterprise support blog into the boot image.
Using PXE boot, the machine starts up in WinPE when we deploy the task sequence, but every time it reaches the "preparing network connections" message in the splash screen, WinPE quits and the machine reboots.
I've hit F8 to get the command line while WinPE is booting, and from running ipconfig there, it looks like the machine takes a long time to pick up its IP address from DHCP, but it DOES pick up an IP address eventually which implies to me that the NIC driver
is at least somewhat working.
See below for the wpeinit.log file from this machine. What am I doing wrong? What's that message about "no operational adapters found", expecially when I've verified that it does get an IP address (albeit after a short while)?
BEGIN WPEINIT LOG:
Info      No unattend file was found; WPEINIT is using default settings to initialize WinPE
Info      ==== Initializing Display Settings ====
Info      No display settings specified
Info      STATUS: SUCCESS (0x00000001)
Info      ==== Initializing Computer Name ====
Info      Generating a random computer name
Info      No computer name specified, generating a random name.
Info      Renaming computer to MININT-S90VG8D.
Info      Acquired profiling mutex
Info      Service winmgmt disable: 0x00000000
Info      Service winmgmt stop: 0x00000000
Info      Service winmgmt enable: 0x00000000
Info      Released profiling mutex
Info      STATUS: SUCCESS (0x00000000)
Info      ==== Initializing Virtual Memory Paging File ====
Info      No WinPE page file setting specified
Info      STATUS: SUCCESS (0x00000001)
Info      ==== Initializing Optional Components ====
Info      WinPE optional component 'Microsoft-WinPE-WMI' is present
Info      WinPE optional component 'Microsoft-WinPE-WSH' is present
Info      STATUS: SUCCESS (0x00000000)
Info      ==== Initializing Network Access and Applying Configuration ====
Info      No EnableNetwork unattend setting was specified; the default action for this context is to enable networking support.
Info      Acquired profiling mutex
Info      Install MS_MSCLIENT: 0x0004a020
Info      Install MS_NETBIOS: 0x0004a020
Info      Install MS_SMB: 0x0004a020
Info      Install MS_TCPIP6: 0x0004a020
Info      Install MS_TCPIP: 0x0004a020
Info      Service dhcp start: 0x00000000
Info      Service lmhosts start: 0x00000000
Info      Service ikeext start: 0x00000000
Info      Service mpssvc start: 0x00000000
Info      Released profiling mutex
Info      Spent 1310ms installing network components
Info      Installing device pci\ven_8086&dev_1502&subsys_05431028 X:\WINDOWS\INF\oem1.inf succeeded
Info      Spent 10437ms installing network drivers
Info      QueryAdapterStatus: no operational adapters found.
Info      Spent 10140ms confirming network initialization; status 0x80004005
Info      WaitForNetworkToInitialize failed; ignoring error
Info      STATUS: SUCCESS (0x003d0001)
Info      ==== Applying Firewall Settings ====
Info      STATUS: SUCCESS (0x00000001)
Info      ==== Executing Synchronous User-Provided Commands ====
Info      STATUS: SUCCESS (0x00000001)
Info      ==== Executing Asynchronous User-Provided Commands ====
Info      STATUS: SUCCESS (0x00000001)
Info      ==== Applying Shutdown Settings ====
Info      No shutdown setting was specified
Info      STATUS: SUCCESS (0x00000001)

Answer 1

This turned out to work for me, too! It was nothing to do with network switch configuration, per se-- or at least I didn't have to change anything on my switch to fix it. Instead I tried fusiongroup's method of getting into the command-line before the WinPE
boot hit the "Preparing network connections" step, and I repeatedly ipconfig /renewed until suddenly the TS reached the next step of the sequence instead of failing out.
I also made this an "Available" sequence instead of a "Required" sequence, which I think buys you a little time in terms of offering a GUI in WinPE for the sequence, instead of just trying to run it.
One last thing: I was running this on a Workgroup machine that is not joined to our domain; I had followed another tutorial to get the client installed on it even though it's outside the domain. Prior to trying the command-line fix fusiongroup gave, I also
went into Assets and Compliance in Configuration Manager and right-clicked the machine in the list of devices, and found that I had to "Approve" it for management by SCCM. Don't know if that helped as well.
Sylvie Andrews