Article ID : S500018571 / Last Modified : 11/04/2018

What to do when an error about hardware-assisted virtualization occurs when using Windows XP mode?

An error about hardware-assisted virtualization occurs when using Windows XP mode.

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You may receive one of the following errors when trying to install, use or configure Windows XP Mode in Windows Virtual PC on a computer running the Windows 7 operating system. These errors may occur if the processor (CPU) in your computer does not support hardware-assisted virtualization (HAV), such as Intel Virtualization Technology (Intel VT), or this feature is not turned on.

NOTE: More information about this issue is available in Microsoft KB Article ID 977206

- Unable to start Windows Virtual PC because hardware-assisted virtualization is disabled
- Cannot start Windows Virtual PC Host Process. Check the System event Log for more details
- Windows Virtual PC cannot start because this computer does not support hardware-assisted virtualization 
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To resolve the errors, first determine if the CPU in your computer supports Intel VT and then use one of the resolutions below:

IMPORTANT: If your computer supports Intel VT, but the setting in the BIOS is not showing, a BIOS update may be available to display this setting. Updates are available online through the downloads section of the support website.

- If the CPU supports Intel VT, enable it in the BIOS.

- If the CPU does not support Intel VT or a BIOS update is not available that allows you to turn on Intel VT, download and install one of the following Microsoft updates to remove the Intel VT prerequisite:

    - For the Windows 7 64-bit operating system use the Update for Windows 7 for x64-based Systems (KB977206).
    - For the Windows 7 32-bit operating system use the Update for Windows 7 (KB977206).