Go to Settings > Apps > Features and remove any existing "Sentinel System Driver" or "Sentinel Protection Installer."
Even if not prompted, a reboot is necessary to initialize the driver services. rainbow sentinel system driver 73 2 windows 10 link
Supports older parallel port keys (though these may require additional BIOS configuration). Go to Settings > Apps > Features and
Ensure the "Sentinel LDK License Manager" or "Sentinel Protection Server" is running in the services.msc panel. Download Link Information rainbow sentinel system driver 73 2 windows 10 link
The transition to Windows 10 caused significant compatibility issues for older hardware drivers. Versions older than 7.3.2 often trigger the dreaded "Blue Screen of Death" (BSOD) or simply fail to recognize the dongle, resulting in "Security Key Not Found" errors.