thanks a lot,Nxs
I think I played ~150 times to achieve this,hope it was worth it.
Also,thanks slugbug for helping

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Current system:
Pentium 4 2.4C Northwood
Asus P4P800 SE
4x512MB Ram DDR1 Twinmos
Nvidia 6800 Ultra 256MB DDR3
Sound Blaster Audigy
Nec 3540A Dvd Writer