Windows 9x, 2000 and NT for ISA and PCI
Double click the "Modem575.exe" file. From this point you should start to see the file self extract into the c \windows\temp directory.
A welcome screen will appear asking you "Do you want to install the drivers?" Click the "next" button to continue with the installation or the "cancel" button to abort the installation. If you click the "next" button, the modem driver will begin to install.
After it finishes installing, it will prompt you to restart your computer. Click the "finish" button to restart your computer. After this point the installation is complete.
I work for an ISP and we have installed this driver at least a dozen times and it seems to work great.