Hyper-V is a Type-1 hypervisor. If you install VMware Workstation or Oracle VirtualBox with their hypervisor modules (like VMM or Kernel drivers), they compete for the CPU's virtualization extensions. When Hyper-V launches, it expects exclusive ownership. If another hypervisor holds the lock, Hyper-V fires event 167.
: Uninstall proprietary motherboard software (like ASUS AI Suite 3 or Armoury Crate ) that may be conflicting with the hypervisor. 4. Advanced Diagnostics hyper-v-hypervisor 167
This article provides a deep dive into what error 167 means, why it appears, and step-by-step methodologies to resolve it permanently. Hyper-V is a Type-1 hypervisor
Unlike generic "VM won't start" errors, Event 167 is highly specific to CPU state and security settings. There are four primary triggers: If another hypervisor holds the lock, Hyper-V fires
: This is done in your motherboard's BIOS/UEFI settings. Note that this may slightly reduce multi-threaded performance in exchange for higher security.