I have just done this with an HP laptop but a completely different model.
It can be a challenge.
This website helped me a lot but you have just said a dv7....there are a multitude of variations of this model....you need to provide the full model name.
Here is a start for a dv7-7255ER
Another trick is to find the make and model of your ethernet and wireless cards and go to the manufactures website for win 7 drivers....I did this while I still had win8 installed...it's a lot harder when in win7 with unknown device and a yellow exclamation mark next to it
Google specifications of your model and it may list the type of cards you have.
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