Windows 8.1 and no wifi

Hello,
I just upgraded from 8.0 to 8.1 and the wifi doesn't work at all.
I googled it and it seems a common problem since the preview release.
I reinstalled the driver many times but nothing changed.
I tried to install the beta driver that is in the sticked topic, but I get an error!
I have:
Windows 8.1
Z77 Mpower
GTX 660Ti
16 GB RAM

Drivers for Z77 Mpower (Windows 8.1)
Bluetooth 3.0+HS module (Atheros AR3011) 
WiFi 802.11b/g/n 2.5 GHz only module (Atheros AR9271) 

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