How to add nic drivers to boot image on WDS server

I have configured WDS server on windows 2008 ent SP2 but am not getting driver node option on my WDS server, please help me..

I am getting this error: WdsClient: An error occurred while obtaining an IP address from the DHCP server. Please check to ensure that there is an operational DHCP Server on this network segment.

so i want to add nic driver on boot.wim image