Model: Riptide 90079
Operating System: Windows ME (Note: might work with other versions of this os.)
HP Pavilion 4540
PCI combo board sound and modem.
This driver worked with a new install of Win ME.
There is no setup program required. By default the files will unzip to a floppy disk. If nothing else works open device manager, modem and select update driver
NOTE This driver is for the modem only. The sound driver is here at driverguide.com also.