I can't use HD4000 under Windows 7 and 8?

I installed Windows 7 in my rMBP(15 inch), but I found HD4000 was disabled under Windows 7(the same to Windows 8), only GT650M can be used. Who can help me?

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Windows doesn't have the ability to use both GPUs, so you can use only the dedicated GPU. Unfortunately, there's no fix for this

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