What link were you using to download the driver?
Under Windows all of our PCI, PCIe and USB to Serial products require the same driver, which can be downloaded via the following link:
http://lavalink.com/wp-content/uploads/d..._07_15.zip
Once you've downloaded the file and extracted its contents to your desktop you should only need to point the Windows Device Manager to the root of the folder where you extracted the files.
Let me know if you're still having trouble with the installation and I'll be happy to assist further.
- Lava Support