Downloaded the zip file, extract the files and remember that path.
Then uninstall your current modem. (You may use the LTremove.exe included in this .zip file)
Reboot your machine
System will detected the PCI modem again.
When prompted for installation disk, browse to where you extracted the files and click
<OK> to continue the driver installation.
You may wish to remove the extracted driver files after the upgrade installation.
By The Way! If you are looking for drivers of this modem on other Windows OS - I have previously uploaded versions for - Windows98, Windows200 or WindowsXP, you can find them on this same website using the keyword: mdp7800-U modem
Best Regards, Felipe