Windows 11 generally requires all drivers to be digitally signed by a trusted authority. Most versions of multikey.sys found online are self-signed or modified, requiring users to disable "Driver Signature Enforcement"—a move that significantly weakens system security. Common Problems and Fixes
If multikey.sys was installed by a specific application or emulator, uninstalling that software via Settings > Apps is the cleanest fix. Delete the Driver Manually: If the file persists and causes boot loops: Navigate to C:\Windows\System32\drivers\ multikey.sys and delete it (or rename it to multikey.sys.old to disable it). Check Device Manager: Look for "Virtual USB Multikey" or "Sentinel" entries under Universal Serial Bus controllers . Right-click and select Uninstall device multikey.sys windows 11