Copy this file onto a blank 3.5-inch disk. In Control Panel, double-click Modems and remove all Sportster modems. Shutdown the computer, connect and turn on the modem, and restart the computer. When prompted, insert the disk and choose "Driver from disk provided by hardware manufacturer" or "search for the best driver" and click OK. Direct the installation to search the 3.5-inch disk. Select the USRobotics 56k fax external and then follow the prompts to finish the installation.
Copy this Universal INF file onto a blank 3.5-inch disk. When prompted for the driver during the installation, select "Have Disk" and direct the installation to the 3.5-inch drive. Select mdmusr01.inf from the 3.5-inch disk and follow the prompts to finish the installation.