FYI - In case you need the drivers for the NIC and storage (SCSI) adapters for your 32bit WinPE image. These worked for me. It was a super pain in the rear.
NIC - Broadcom BCM57xx & BCM57xxx (formerly Broadcom NetXtreme II) drivers (there are two)
Link to download the driver: http://downloads.dell.com/network/NIC_DRVR_WIN_R306483.EXE
Process: Download the driver and run the EXE to extract the files. Inside the unpackaged folder, you'll need to use the bxnd.inf file located in "program files\QLogic Corporation\QDrivers\Win2k8" directory AND bxvbd.inf from the "program files\QLogic Corporation\QDrivers\VBD" directory. You'll probably need to inject the bxvdb.inf manually. For some reason the GUI method of injecting drivers blocked it.
SCSI - Dell PERC S100/S300
Process: Download the driver and run the EXE to extract the files. Inside the unpackaged folder, you'll need the bcraid.inf file.