用vagrant启动VirtualBox时出错

我把我在piazza讨论组里面发的问题和解决方法直接拿过来了，所以是英语的

"vagrant up" failed to boot the virtual machine

win7 64bit

VirtualBox-4.3.28-100309-Win 

vagrant_1.7.2

After typing "vagrant up" in cmd, it comes to this, and the virtual machine "sparkvm" is always "Powered Off", I don't know what's going on. Could someone please give me some help?

解决方法：

Well, it turns out that the problem is about "uxtheme.dll" file, I just downloaded an original uxtheme.dll and replaced the c:\windows\system32\uxtheme.dll, then the problem was solved.