a windows image?
i'm going to guess and assume you want to install windows on to a machine that you have pxe booted. Well you won't be doing this with non Microsoft software.
Microsoft being who they are like to keep everything to themselves. They want you to use something called RIS (Remote Installation Server).
I've found this page
which details how to setup windows 2000 server as a RIS.
If this is not what your trying to do then please provide some more info and i'm sure someone could think up some method to achive what you are trying.