Atheros, I checked my WinPE System hive, and it had all of the settings. I also checked windows\system32\drivers subfolder for missing driver files. Based on the registry values that you posted, there was one missing file -USBSTOR.sys. I copied it to the WinPE drivers subfolder from my own Vista workstation's drivers subfolder. However, after doing this, I'm still getting the 7B stop error, so at this point I would probably need a checklist of all of the usb driver files that I should have in the WinPE drivers folder to make sure that I do have all of the necessary driver files in this WinPE image.