Event ID 41 — Hypervisor Availability

Applies To: Windows Server 2008

This is preliminary documentation and subject to change.

Hypervisor availability

Event Details

Product: Windows Operating System
ID: 41
Source: Microsoft-Windows-Hyper-V-Hypervisor
Version: 6.0
Message: Hyper-V launch failed; Either VMX not present or not enabled in BIOS.


Check BIOS settings

Contact your hardware supplier for an updated BIOS.

Hyper-V requires hardware support, including: an x64 CPU; VT (Intel) or AMD-V (AMD) hardware extensions; No eXecute (NX)/eXecute Disable (XD) and full BIOS support for hardware virtualization. Check your physical computer's BIOS settings to ensure that virtualization features are enabled, then turn off the power to your physical computer. Restart the physical computer. NOTE: Restarting the physical computer is not sufficient.

You can use the Virtualization Detect (DetectVp.EXE) tool to check if the physical computer meets the requirements for Microsoft Virtualization Software. This test checks virtualization support for both Intel and AMD processors.

To download the WDK .iso file:

1 - Go to the Microsoft Connect Web site at http://go.microsoft.com/fwlink/?LinkID=100623 and sign in with your Windows Live ID.

2** -** Enter the Microsoft Connect Web site. Click Connection Directory.

3 - Click Developer Tools, then click "Windows Driver Kit (WDK), Windows Logo Kit (WLK) and Windows Driver Framework (WDF)."

4 - Click the Download link  to download 6.1.6001.18002.081017-1400_wdksp-WDK18002SP_EN_DVD.iso


Hypervisor successfully starts.

Hypervisor Availability