Very obvious answer (sorry about that smile ): maybe you can find a Windows 7 x64 installation CD somewhere and reinstall it? I suppose you've still got your license number (usually a sticker on the underside of the device). Windows 7 is still supported until 2020.
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup