New machine has Vista according to him. He wants to use the XP hard drive as a secondary drive. I think we need clarification. You want to dual boot or just wipe the drive and use it for storage or whatever? If you dual boot I think you have to put in mother board drivers, video drivers and all the rest to make it work.

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Intel 6320
4 gigs ddr2 ram
160 gig sata
evga 8800 gts video card
vista home premium sp1 - 64 bit