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Hyper-V: Configure virtual machines running Windows Vista with 1 or 2 virtual processors

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Applies To: Windows Server 2008 R2, Windows Server 2012

This topic is intended to address a specific issue identified by a Best Practices Analyzer scan. You should apply the information in this topic only to computers that have had the Hyper-V Best Practices Analyzer run against them and are experiencing the issue addressed by this topic. For more information about best practices and scans, see Best Practices Analyzer.

Operating System

Windows Server 2012 or Windows Server 2008 R2

Product/Feature

Hyper-V

Severity

Configuration

Category

Error

Issue

A virtual machine running Windows Vista is configured with more than 2 virtual processors.

Impact

Microsoft does not support the configuration of the following virtual machines: <list of virtual machine names>

Resolution

Shut down the virtual machine and remove one or more virtual processors.

By default, membership in the local Administrators group, or equivalent, is the minimum required to complete this procedure. However, an administrator can use Authorization Manager to modify the authorization policy so that a user or group of users can complete this procedure. For more information, see Using Authorization Manager for Hyper-V Security (https://go.microsoft.com/fwlink/?LinkId=142886).

To remove virtual processors

  1. Open Hyper-V Manager. Click Start, point to Administrative Tools, and then click Hyper-V Manager.

  2. In the results pane, under Virtual Machines, select the virtual machine that you want to configure. The state of the virtual machine should be listed as Off. If it is not, right-click the virtual machine and then click Shut Down.

  3. In the Action pane, under the virtual machine name, click Settings.

  4. In the navigation pane, click Processor.

  5. On the Processor page, set the number of processors to 1 or 2 and then click OK.