Inspiron 3552 - Scripted install problem

I'm trying to do a Windows 7 scripted install on a Dell Inrpison 3552. The Ethernet connection is a StarTech USB-Ethernet dongle, and I've put the drivers in both DeployAnywhere and preboot. I can boot from a flash drive and start the scripted install, but it fails with this:

ErrorMessage: Exception has occured in function SMPPackage.cpp() at Line No 716. Type of exception is GeneralError. Error is The filename, directory name, or volume label syntax is incorrect. Error Description is utilCSMPPackageGetMultiplesFileFromHTTP. Value of Windows error code = 6 and message is The handle is invalid.

The computer won't boot, telling me there's no OS.

This same scripted install works flawlessly elsewhere.

Thoughts?

Thanks!