Windows 2008 Server Core Configurator was designed to be a collection of scripts which will help provision and configure a Base Windows 2008 Server Core installation Windows Small Business 2008 best practices analyzer
Register Hereor login if you are already a member
First of all make sure that, make sure you have the correct version of Core Configurator. After downloading one of the problem is that this brand new Server Core deployment can't access the network at first. While Core Configurator is designed to do is to help initially configure the network settings. Therefore, it wouldn't make sense to manually configure the server just to access the Core Configurator installation files from a network share. If you know how to do that, then you don't even need Core Configurator.
Next you may counter, that many virtualization platforms like Microsoft Hyper-V doesn't allow guest system to access USB based storage devices.
Only asking step by step procedure is not a solution. Better come with error(s) that can be helpful to locate your problems.