最近在 Parallels Desktop 里装了个Win7,然后Win7里装VMWare Workstation 8,出现错误：

You are running VMware Workstation through an incompatible hypervisor.  You cannot power on a virtual machine until this hypervisor is disabled.

解决方法如下：
编辑 Metasploitable.vmx 文件末尾添加：vmx.allowNested = TRUE

虚拟机可以正常启动。