Hi laurent_31,
To make sure there is no pre-selected option in your profile or any issue with the drivers, you can remove your wireless driver and the Intel® My Wi-Fi Dashboard driver along with the wireless profiles folder in your computer, and download them and reinstall them again. Here is step by step the right way to do it:
1- First download the latest drivers and software package (wireless_15.5.6_e64.exe) and save them to your desktop.
Then download the dashboard software: (Intel_My_WiFi_Dashboard_15.5.6_e64.msi)
http://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=22008
3- Remove the Intel® PROSet software from Control Panel\ program and features or uninstall a program.
4- Go to the desktop view, right side bar, click on settings then on “PC info” click on ‘device manager’ (on the left panel) click on “Network Adapters”\Double-Click the adapter name\Drivers Tab and click on the “Uninstall” button if present. (You may also just click on the search option in the windows side bar and type “device manager”)
5- Remove the Wireless folder found at C:\Users\your user name\Roaming\Intel.
6- Install the latest drivers. (Right-click on the icon of the driver, and click on “run as administrator”)
You can check the following links for more information:
Recommendations after upgrading from Windows 7* to Windows 8*
http://www.intel.com/support/wireless/wlan/sb/CS-033845.htm
Intel® Wireless Products and Microsoft Windows* 8
