I am using Server 2008 R2, i have installed WDS and am trying to set up the server for imaging Windows 7. I have added a boot image and an install image to the server. DHCP is not on the same server, so I have changed ports 66 & 67 on the DHCP server as instructed by documentation found on technet. When I boot from a client machine using the PXE boot option, I get the error PXE:E%# No Boot File Name Received. Any suggestions?