when I gave you the link to NVIDIA's nForce chipset driver set 15.25, I thought, that you are running your SATA devices in AHCI mode. The 15.25 sets are the last ones, which contain nForce SATA and RAID drivers, which do fully support nForce 560/520 chipsets. All the other nForce drivers of the 15.25 (Ethernet, SMU etc.) are not important for you, because there are newer ones out, which may work better with your chipset.
The problem for you is, that there is no NVIDIA nForce SATA driver at all available for your chipset, if the SATA Controllers have been set to IDE mode. The default IDE mode SATA driver for MCP65 systems is the generic MS driver PCIIDE.SYS, which is managing the "Standard Dual Channel PCI IDE Controller". So you will not be able to solve your problem by changing the SATA driver, unless you get the chance to set the SATA Controllers to AHCI mode. You should ask the manufacturer of your mainboard for a BIOS update.
SToPGAP wrote:On a slightly different note - the drivers you linked to, should they have shown multiple options for selection when I was installing? I only got SMU and Away mode driver (not even sure what that one is) in the list of items to install... I've found similarly few options in other driver sets - it almost seems as though certain parts of the nForce install are being missed as it's not seeing them... I know in the past on nForce2/3/4 installs I've had many more options.
It is rather normal, that the installer of any nForce chipset driver set won't give you the option to install all drivers of the set.
Example: The included nForce IDE drivers of the 15.25 set are not usable with your chipset, because you are running the SATA Controllers in IDE mode and none of the nForce IDE drivers do support the IDE mode of your chipset.