You should upgrade the chipset drivers as well.
Also please watch the behavior in safe mode with networking to rule out 3rd parfty software interference. See http://windows.microsoft.com/en-us/windows-8/windows-startup-settings-including-safe-mode
This subject of securing wireless devices conjures up visions of your PC or mobile phone connecting to the Internet through some hotspot at Starbucks. But it is so much more than that. Let’s look at the facts: devices#sthash.eoFY7dic.
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting.