It is not recommended to download and install any of the brandnew nForce chipset driver packs v15.17, which NVIDIA is currently presenting on their homepage for Vista (32/64bit) and Windows XP (32/64bit), because they messed up a lot of things:
1. The "Vista" packs contain the XP drivers and vice versa.
2. If you choose the english (US) version, you get the international one.
3. Some users reported, that NVIDIA even mixed 32/64bit driver/installer versions.
4. The NVIDIA website list with nForce chipsets, which are supported by the new chipset droiver pack 15.17, is not correct (nForce4 Intel chipsets are listed, but not supported by the nForce IDE drivers v10.3.0.21, whereas the nForce 430/410/405/400 chipsets are not listed, but supported).
I recommend to be patient and to wait until NVIDIA has corrected their websites.
Update:
Meanwhile NVIDIA obviously has repaired their download links and the package file names.
If you choose the XP (32/64bit) driver version, you won't get Vista drivers anymore (and vice versa).