First insert the modem into the USB port of your computer and wait for Windows to make it available in My computer. Right click the modem and select Explore. Locate the application and right click it. Select Properties > Compatibility > Windows XP and proceed to its installation using Run as Administrator.
Restart the computer and plug the USB back then go to Device Manager (Computer > Properties > Device Manager). Locate the modem in the list and select it using Update driver. Point the installer to the installation folder in Program Files and your modem is installed.