questions about WDF using Visual Studio 2012 and virtual box

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Windows

Win7

driver

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I wanna develop usb drivers using WDF in Win7 ,I heard that WDF was intergrated with Visual Studio 2012,so I followed msdn guidance,the site is http://msdn.microsoft.com/en-us/library/windows/hardware/hh439654(v=VS.85).aspx.After installing Visual Studio 2012 and configuring serial ports between virtual box and the host pc, I began to debug the template WDF. However, it seemed that the debugger could not make any progress while it was deploying. In the virtual pc, I could see that the virtual device made by template driver was added,but there was nothing listed in the module window in Visual Studio.I uesd DebugView to catch kernel in another try, but what DebugView listed was "Invalid parameter passed to C runtime function" and there's no contents of Kdprint function added in the top of DriverEntry.

I am being confused about it.

So how to make it?
host pc: win7 x86,visual studio 2012
target virtual pc: win7 x86,configured by visual studio 2012 in host pc.