Re: DRIVER NEEDED: American Megatrends m266a p.1.60 (Windows XP Home) [IDE]
VIA® P4M266A is not a motherboard brand or model, it's a VIA chipset that can be used on numerous motherboards including the Asrock M266A motherboard. AMI is a bios maker...they have nothing to do with building the motherboard.
Until you can identify the mb. and manufacturer along with the sound chipset number, all I can suggest is to try the sound driver from Asrock here: