Verify in Device ManagerOnce installed, right-click your Start button and select Device Manager. Look for a category called Smart card readers. You should see "EZ100PU Smart Card Reader" listed without any yellow exclamation marks. Troubleshooting Common Issues

Download the Official Driver PackageIf Windows Update fails, you need the official driver. Look for the "EZ100 Series" driver package provided by Castles Technology. Ensure you are downloading the 64-bit version, as Windows 11 does not support 32-bit architecture.

Use Windows UpdateBefore hunting for manual files, let Windows do the work. Plug in your EZ100PU, go to Settings, then Windows Update, and click Check for updates. Check the Optional updates section under Advanced options to see if a specific "Castles Technology" or "Smart Card Reader" driver is listed there.