我试过在Windows 7上安装docker（使用boot2docker）。但是控制台只是突然存在，我看不到错误，更不用说运行任何命令了。

在安装过程中，我尝试安装和不安装VirtualBox。我也尝试卸载并重新安装docker和virtualbox。似乎没有任何作用。

这是我运行时看到的控制台错误boot2docker -v up：

Boot2Docker-cli version: v1.3.0
Git commit: deafc19
2014/10/26 20:47:11 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe showvminfo boot2docker-vm --machinereadable
2014/10/26 20:47:12 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe guestproperty set boot2docker-vm /VirtualBox/GuestAdd/SharedFolders/MountPrefix /
2014/10/26 20:47:12 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe guestproperty set boot2docker-vm /VirtualBox/GuestAdd/SharedFolders/MountDir /
2014/10/26 20:47:12 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe sharedfolder add boot2docker-vm --name c/Users --hostpath C:\Users --automount
VBoxManage.exe: error: Shared folder named 'c/Users' already exists
VBoxManage.exe: error: Details: code VBOX_E_OBJECT_IN_USE (0x80bb000c), component SessionMachine, interface IMachine, callee IUnknown
VBoxManage.exe: error: Context: "CreateSharedFolder(Bstr(name).raw(), Bstr(hostpath).raw(), fWritable, fAutoMount)" at line 1009 of file VBoxManageMisc.cpp
2014/10/26 20:47:12 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe setextradata boot2docker-vm VBoxInternal2/SharedFoldersEnableSymlinksCreate/c/Users 1
2014/10/26 20:47:12 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe startvm boot2docker-vm --type headless
Waiting for VM "boot2docker-vm" to power on...
VBoxManage.exe: error: VT-x is disabled in the BIOS. (VERR_VMX_MSR_VMXON_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component Console, interface IConsole
2014/10/26 20:47:15 executing: C:\Program Files\Oracle\VirtualBox\VBoxManage.exe showvminfo boot2docker-vm --machinereadable
error in run: Failed to start machine "boot2docker-vm": exit status 1