For the EZ100PU Smart Card Reader to function optimally on Windows 11, you must address modern security features like Core Isolation that often block its legacy drivers . While Windows 11 may attempt to use a generic Microsoft Usbccid (WUDF)
Forget the original CD. The most reliable driver for the EZ100PU on Windows 11 is the included with Windows, or the specialized driver from REINER SCT (which also works for many clones). ez100pu smart card reader driver windows 11 better
Some older drivers conflict with Windows 11's "Core Isolation" security features. For the EZ100PU Smart Card Reader to function
Click and toggle Memory integrity to Off . Check for Optional Updates : Some older drivers conflict with Windows 11's "Core
Use 3.7.3.0 for Windows 11. Avoid automatic Windows Update drivers – they install an old 2015 version that breaks.
I am not affiliated with Castles Technology – just a user who wasted 3 days on this so you don’t have to.