Multikey.sys Windows 11 ◉

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One user reported that after updating to Windows 10 (and potentially on Windows 11), their PC began to restart periodically with the error KMODE_EXCEPTION_NOT_HANDLED , with multikey.sys named in the crash dump. A forum expert described the driver as a “crappy driver” that incorrectly closes threads during kernel object destruction. Incompatibilities with Windows 11’s memory integrity features (HVCI) often trigger these crashes. multikey.sys windows 11

"The key doesn't open the door. It shows you that there is no door." Select

This feature in Windows Security can prevent "vulnerable" drivers from loading even if they are signed. : If your software uses SafeNet keys, refer

: If your software uses SafeNet keys, refer to the SafeNet Sentinel HL Key documentation for manual installation steps.

The file multikey.sys is a well-known third-party driver tightly associated with hardware key emulation. If you have recently upgraded to Windows 11, or if you are auditing your system logs, you might encounter this file causing compatibility errors, system crashes, or triggering antivirus alerts. This guide covers what multikey.sys does, why Windows 11 blocks it, and how to safely handle it. What is multikey.sys?

What are you trying to run with this driver?