Hi Chris,
For groovy update we've only done testing on Win7-64 so far. I used to use WinXP for electric-fuerte prototyping.
They updated ros_comm for ipv6, so you're probably seeing an artifact of that change. That is the only thing that went into ros_comm over the last two ros distros so if that is fixed, there shouldn't be anything else to prevent it from running on winxp.
I currently don't have much time right now (busily preparing for ICRA and RosCon) as well as another project deadline looming, but if you manage to work it out, I'll check it over and make sure it gets patched upstream for you.
Cheers,
Daniel.