Vista sharing and subnet

Hi folks. I'm wanting to share out my DVD drive (and some ISO images on my
machine) so that I can use it for iLO on our HP blade servers, however,
although I have set up sharing (based on all the posts etc I have read), I
cannot get the blades to find them through iLO. The DVD drive pops an error
saying it can't be found, and the folder I share just doesn't seem to become
available. I've even tried images and pointing it accordingly, and I get a
USB device error from the blade. Any suggestions? This worked perfectly from
my XP Pro box, but not Vista. I'm running Ultimate if that matters greatly.