Modern antivirus programs often flag virtual USB drivers as "Trojan" or "Riskware" because they interact directly with the system kernel. Open Windows Security > Virus & threat protection. Go to Manage settings and scroll down to Exclusions.
Alternative: If you cannot find the folder, download the latest from the Thales/Gemalto website or your Mastercam vendor portal. mastercam virtual usb multikey not working
| MasterCAM 版本 | 推荐或兼容的 Multikey 驱动类型 | 常见问题与备注 | | :--- | :--- | :--- | | X系列 (X5-X9) | 较旧版本驱动，可能需 Win7 环境或禁用签名 | 在新版 Win10/11 上安装尤其困难，强制签名是主要障碍。 | | 2017/2018/2019 | 需特定版本虚拟狗，如 V7.0 | 安装时请严格按照教程步骤操作，确保无杀毒软件干扰。 | | 2020/2021/2022 | 需特定驱动，推荐用“2024 Multikey”通用版尝试 | 部分 Windows 更新可能会破坏此版本的驱动。 | | 2023/2024/2025 | 推荐使用“Multikey 2024”或更新的通用许可证驱动 | 签名问题最严重，必须强制关闭签名检查或使用特殊版本安装。 | Modern antivirus programs often flag virtual USB drivers
If you see MultiKey.sys listed, restore it and select . Alternative: If you cannot find the folder, download
What are you running (e.g., Windows 10, Windows 11)?
: This confirms a signature issue. Follow the Test Mode steps above to bypass it. 3. Use Mastercam Diagnostic Tools