Before you do the preposting requirements, can we try something else? See below....
Remove all network profiles stored from the problematic computer, then re-add your SSID (or wireless network) with the proper encryption, here's a Tutorial from Brink
Also, if you are using a wireless manager or utility for your Wi-Fi device, this might be conflicting with your WLAN Auto Configuration that you might find under Services (click on the Start button type services.msc
then press enter). In this image, the native WLAN Auto Configuration service is Started, but if you are using a wireless manager, make sure that this is disabled.