This driver is for a GVC SF-1156IV/R9A 56k Modem. I got this Driver directly from Gateway (not that you need a Gateway PC to use these modem Drivers for Win2k). I did dial out on the modem,to ensure the these drivers did in fact work, so they are tested. If you want to go get the driver yourself, go to gateway and the serial number for this PC is "0024189737" & the model No. is "Pro S P4 - 1300 SE".