Open the "Windows Device Manager" (in section "Parameters" in Windows), locate your usb interface (in section "Universal Serial Bus controllers"), right-click on its name or icon and select "Update driver".
Click on "Browse my computer for driver software" (this option will allow you to manually select the driver you want installed).
Click on "Let me pick from a list of device drivers on my computer".
Click on "Have Disk".
For 32bits OS, click on "Browse" and select the INF file with the name of your interface, in folder "32bits" of "drivers.zip"
For 64bits OS, click on "Browse" and select the INF file with the name of your interface, in folder "64bits" of "drivers.zip"
Wait while the Update Driver Software wizard completes the driver installation process.
Assuming the driver update process completed successfully, you'll see the "Windows has successfully updated your driver software" message.
Close the window.