What could be causing problems with network install of Debian?

What could be causing problems with network install of Debian?

I'm trying to perform a Network install of Debian on a spare PC I have. I'm using Windows XP Pro as my "server" machine and the "client" has a clean Hard Drive with several network cards in that can use PXE. I've managed to find several useful guides on how to do this BUT at crucial points the information seems to become a little sparse.