MBP display turns off when external monitor is attached

Hi there,
Over the last few days I have been trying to get Windows 7 to work with an external monitor. I am running a Mid 2012 15" Macbook Pro with a Nvidia GeForce GT 650M GPU. I sucessfully installed windows 7 in bootcamp and everything worked flawlessly until I try to connect my monitor with the mini displayport via a VGA <-> Displayport adaptor. When I connect it the monitor powers on, with the windows desktop and is responsive but the mouse dissapears and the MacBook Pro's monitor turns off. The mouse is still useable but invisible, so its very difficult to do anything. I have tried to update the Nvidia drivers as well as  trying everything I can think of and haven't been able to  find a solution. Has anyone else out there exerinced this, or found a solution?

Okay, so a little update. I have determined that the problem is the nvidia driver. When I roll back the driver to the "Microsoft Basic Display Adaptor" driver and connect the monitor then it behaves as excpected. The external monitor isn't detected and everything continues to work properly.
So is there anyone out there who is running a Mid 2012 15" MacBook Pro with an external monitor in either Windows 7 or 8.1? If so please let me know what your setup is and what driver version you are using. This is driving me crazy. Thanks.

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