You cannot simply install multikey.sys directly. The typical procedure involves:
If the file properties look different, especially if the company name is missing or suspicious, treat it as potential malware.
: Kernel drivers execute commands with the highest possible privileges. A vulnerability in an old version of multikey.sys can allow malware to bypass all Windows 11 defense layers.
Run the provided .bat or .exe installer (e.g., install.bat ) as an Administrator. multikey.sys windows 11
Click on in the top menu and check Show hidden devices .
This information is provided for educational purposes, particularly for maintaining compatibility with legacy software systems. If you're interested, I can also: Show you how to use DSEO to sign the driver manually
: Simulates a physical USB security key for software license verification. You cannot simply install multikey
: Software companies use physical USB dongles to prevent piracy of high-end, expensive software (like CAD programs, industrial design tools, or specialized medical software). The driver allows users to emulate these USB keys, bypassing the need to have a physical dongle plugged into the machine.
Here is an interesting look at why this file still pops up and how to handle it today. The "Dongle Hack" Legacy Historically, multikey.sys
MultiKey не устанавливается, отозван сертификат A vulnerability in an old version of multikey
This allows Windows to load drivers that haven't been verified by Microsoft.
Almost all major security suites, including Windows Defender, flag multikey.sys as a Trojan, Riskware, or Potentially Unwanted Application (PUA). How to Fix MultiKey.sys BSOD Errors on Windows 11
Windows Defender may flag the file as VirTool:Win64/Multikey.A or similar.