Uses a Conexant RS56/SP-PCI chip (r6793-17). Should work with Windows 95, 98, and ME.
This PN576v modem driver is in a self-extracting (exe) format. Run it, and choose where to uncompress the file. Then when Windows asks for the driver, guide it to that location. The default unzip location is c \windows\temp
I found this driver by searching Google.coom for "pn576v driver"