This has happened once before after an update and I solved it somehow, I just can't remember how. However, it also says that the driver version is 15.200.1060.0 so there's a driver but it's not loaded for some reason? Updating the driver just says that the best driver for the device is already installed. My Radeon HD 3850 is listed under Display adapters in Device Manager, but it says 'No drivers are installed for this device.' in the properties.
I just updated to build 10565 and now I can only use Microsoft Basic Display Driver for the display, so I'm stuck at 1280x1024 at best. Download Microsoft Basic Display Adapter By meicrowdayti1979 Follow | Public