Here's a new set of nForce3/4 Drivers version 6.66 for Windows XP 64-bit from Asus.

Audio driver version 4.62 (WHQL) Audio utility version 4.51 Ethernet NRM driver version 4.82 (WHQL) Network management tools version 4.85 SMBus driver version 4.48 (WHQL) Installer version 4.77 WinXP IDE PATARAID driver version 5.34 WinXP IDE SATARAID driver version 5.34 (WHQL) WinXP IDE SATA_IDE driver version 5.34 (WHQL) WinXP RAIDTOOL application version 4.82

nForce Driver 6.66 x64 @ Station-Drivers or from our Forum

Thanks to Garikfox