The Guru of 3D has posted new Windows XP & Windows Server 2003 64-bit beta drivers. Use them at your own risk.

This nForce WinXP 64-bit driver package contains the below components:

Audio driver version 4.60 (WHQL)
Audio utility version 4.51
Ethernet NRM driver version 4.75 (WHQL)
Network management tools version 4.80
SMBus driver version 4.48 (WHQL) with updated uninstaller files Installer version 4.64 WinXP IDE driver version 5.24 with updated uninstaller files WinXP RAIDTOOL application version 4.82

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