There is a way of updating the drivers actually - I think it's nVidia's installation procedure that screws up everything with the IDE drivers.
If you're using WinXP, set a System Restore point before doing this, just in case.

It worked just fine on my system though.
Decompress the nForce installation EXE to a folder, using Winzip.
Go to Windows' Device Manager, and look for your main IDE controller, probably something like "Dual PCI IDE Controller" or similar. I don't know what OS you're using here, so I can't give very specific instructions.
Update/change the drivers for it to the ones in the decompressed nForce folder, in the IDE\WinXP folder (or whatever OS you're using).
This should update your IDE drivers without botching the system. You'll notice that you still have a Primary and Secondary controller listed after the drivers install this way. If you use the SW IDE installation procedure in the nForce setup, these controllers vanish, and all your drives are designated as SCSI devices. I think that's (partially) what was messed up in their installation process.