Why can't I use my WiFi on Windows 8.1?

I just installed Windows 8.1 on my mac mini running OS X 10.10. Bluetooth works fine, all my ports work fine... just WiFi. I know I can connect using Ethernet, but since I'm using a shared modem, I can't. Can anyone help me out?

Please see OSX Yosemite Wifi issues and Yosemite (OS X 10.10) killed my WiFi

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improwise wrote:
I know that it doesnt seem to be possible to use the 9400M in Windows but why is that? Is it a driver issue or what?
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