You'll have to uninstall all the drivers, BIOS, etc from the previous system and install the new ones. If you still have the XP disk, you're better off formatting the drive and starting from scratch
Intel Q6600, MSI P6N 650i, 2x1gb OCZ DDR2 800 RAM, Sapphire Radeon 4870 512mb
1x112gb Samsung, 1x320gb WD, 1x160gb WD
1xSamsung DVD/CD RW drive, PC Power & Cooling 750W PSU, X-Fi Fatal1ty Champion, Logitech Z-560 THX 4.1, NZXT Zero, G5, VW222U 22" monitor
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