我无法启动Hyper V虚拟机。我收到以下消息：
[Window Title]
Virtual Machine Connection
[Main Instruction]
The application encountered an error while attempting to change the state of 'Ubuntu'.
[Content]
'Ubuntu' could not initialize.
The virtual machine could not be started because the hypervisor is not running.
[Expanded Information]
'Ubuntu' could not initialize. (Virtual machine ID 482FFAEF-4BDD-4C1D-86D8-A505A5196EFC)
The virtual machine could not be started because the hypervisor is not running. The following actions may help you resolve the problem:
1) Verify that the processor of the physical computer has a supported version of hardware-assisted virtualization.
2) Verify that hardware-assisted virtualization and hardware-assisted data execution protection are enabled in the BIOS of the physical computer. (If you edit the BIOS to enable either setting, you must turn off the power to the physical computer and then turn it back on. Resetting the physical computer is not sufficient.)
3) If you have made changes to the Boot Configuration Data store, review these changes to ensure that the hypervisor is configured to launch automatically.
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我已经检查过在BIOS中启用了虚拟化。我的CPU - AMD Athlon/Karbini 5350 和主板 - ASRock am1b-itx。 OS - Windows Server 2008 R2。
我也尝试过VMWare并且它可以工作（我已经卸载它并且机器上没有任何其他虚拟机）。
我还应该尝试什么？