Firstly, in order to fix the issue, I suggest your press Windows + Pause/Break key combination and open Device Manager. After that, expand Universal Serial Bus controllers list, right-click on the driver and select Uninstall. Reboot your computer, connect the modem through the USB port and press Scan for hardware changes icon from Device Manger. Also, if you're using Windows XP or below, update Windows Installer using the package provided by Microsoft. If you're using Windows Vista or above, update it through Windows Update. If you still have issues, use the contact information from the official web page to request a new installation package.