Are you talking about the PVR500MCE? If so, it is only supported under Windows MCE (and possibly some of the Linux-based PVR distros). I don't even think it is supported under normal Win XP, based on Hauppauge's web site which ONLY lists MCE even though the PVR250MCE lists 2000/XP and even Me.
Nice price though for dual tuners with hardware encoding.