Yesterday I purchased a Netgear PushtoTV. Then after reading this post and all the responses, I downloaded the WiDi drivers from Dell and like your experience they would not install. However, I quickly discovered that the problem was the fact that the WiDi drivers were already installed on my XPS 12. My XPS 12 was one of the earliest on the market. It was delivered in January. Three months before your device was delivered to you. I used the preinstalled drivers and they work fine. Could this be your problem? Have you used Windows 8 great search feature to check for preinstalled WiDi drivers were on your machine?
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