I noticed you have two SATA drives hooked up, try disconnecting one, making sure the one remaining is set to master, then try to install...could be a RAID issue. If this doesn't work, do what I did the first time I had trouble with my SATA, find an IDE laying around, connect it up and install...probably works more times than not.

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AMD 64x2 4000+
MSI Neo 2 Platinum
2 Gb Corsair DDR 400
WD 160 SATA x2
XP Professional and Kalyway Mac Pro