you placed all the required provisioning-files from the zip in the right place ?
Looks like some of the pxelinux files are missing.
Is there anything useful in the tftpsvr.log that shows what's missing here ?
i don't think it's getting to the point of registering the mac address in bsa yet. that will happen after winpe is loaded on the target.
are you passing the 'next-server' and 'filename' options in dhcp? if you are, you should not.
what's in the tftp server and pxe server log when this happens?
1. Make sure boot files are present on correct location (e.g: Under tftproot directory) also check boot image named it properly in BSA.
2. Hope tftpserver is up and running.