The initial set up for the Windows Phone module can be complicated and some problems may crop up in the process. Below you can find some of the most common things that can go wrong along with a number suggestions and external links to help you fix these problems.
If the "Check SDK" button reports an error there are a number of things that you can do:
Reboot your PC - Sometimes this is required for Windows to register the SDK components correctly.
Re-install the SDK - It's possible that the installation has become corrupted.
Bios problems - You may need to switch offDEP and make sure that your CPU supports the vitualization technology (see below).
Testing from Visual Studio
If you are having problems getting GameMaker:Studio to connect to the emulator, you can try making a test app first in Visual Studio to see if that works correctly, and this test should create the necessary links for GameMaker:Studio to connect. To create a test app, follow these steps:
Run Virtual Studio Express for Windows Phone from the start page of Windows 8 by clicking on its Live Tile
Select New Project from the left hand menu
Simply click "Okay" here to select the standard Windows Phone App.
Select Windows 8.0 as the target platform
Now from the top of the screen you can select the device size that you wish to emulate, and then press play to test (as shown in the following image)
If all has gone correctly you should now see a phone on your desktop with the Windows modern UI visible, and you can interact with it as you would the real thing.
Now close the emulation and go back to GameMaker:Studio and re-test your application. If all has gone well it should work as planned.
Problems with Hyper-V
For problems with the Hyper-V virtualization you should read the following pages: