It's an issue with the driver intel provides and windows 8/8.1. I gave up and switched to a different card brand. If you are interested in trying a work around, I did come across this other thread which seemed to help Intel 7260 AC Wifi adapter not recognized / disabled in Sony Vaio laptop . A user in that thread, KD provided an interesting mod "Taped pin # 20 and pin # 51 on the Intel 7260 AC Wifi card, and reinstalled in system. The wireless and bluetooth functionality is now recognized. " There is a picture on the thread that points out the pins on the card. This seemed to do the trick for some folks. Another link https://communities.intel.com/servlet/JiveServlet/showImage/2-241400-237258/bt_hack.jpg has a picture of the card and pin 51 for bluetooth.
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