It's only in Vista, confirmed. I'm manage to run RO @ XP with the same laptop after installing the Ethernet Controller from a friends.
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Core 2 Duo 1.6 GHz «» 2048MB DDR2 RAM «» 256MB onboard Graphic
Onboard Realtek High Definition Soundcard «» 160 + 40 GB SATA HDD
Pioneer DVD±RW «» 15.4" Widescreen LCD «» Windows Vista Ultimate
Sucks ha? Yeah, that's a laptop for sure.