I'm guessing that your motherboard or graphics card doesn't support the viewing of two screens at once and that you may be encountering problems here. weird seeing as windows usually support a minimum of two monitors natively.
EDIT: I just saw that your graphics are inbuilt into the motherboard, I'm assuming that since you have onboard graphics that this may be the cause. Your motherboard may not support multiple in/outputs with its inbuilt card, you may have to go discrete..
**Just another theory**