During a recent upgrade to the latest version of Windows 11, the SCR3310 USB Smart Card Reader I was using stopped working due to security issues with Microsoft's Device Security related to Core Isolation (Memory Integrity, Local Security Authority Protection), and the Security Processor.

The fix was to go into Device Manager and uninstall the SCR3310 USB Smart Card Reader.

Then, unplug the card reader and put it back in a USB port.

This should load the new Microsoft Usbccid Smartcard Reader (WUDF) drive, and the SCR3310 should be ready.