If you are using a parallel port key on Windows 10, you must ensure the LPT port is set to "ECP" or "Normal" mode in your computer's BIOS settings.
Once the desktop loads, plug in your key. Windows should now display a notification that the "Sentinel Hardware Key" is ready for use. Troubleshooting Common Issues rainbow sentinel system driver 73 2 windows 10 link
Never have your Sentinel key plugged in while installing the driver. This can lead to corrupted registry entries. If you are using a parallel port key
Patches vulnerabilities found in older communication protocols. rainbow sentinel system driver 73 2 windows 10 link