O/S Windows XP Professional.
P4 640 (3.2 GHz, 800FSB, 2MBCache).
2048MB Dual Channel DDR2 533MHz (2x1024) Memory.
320GB SATA RAID 0 Stripe (1st (2x) 160GB 7200rpm) Hard Drive.
256MB nVidia Geforce 6800.
Sound Blaster X-Fi Xtreme music card.
Plus all the normal stuff DVD writers, card readers etc.