i have the same problem since I installed W8 yesterday, to replace Vista SP2 - but the Wireless Devices on/off is greyed out too under PC Settings. My FujSie Amilo 1718 has a quick key to press to activate wifi, but that doesn't do anything . Internet access is fine over an ethernet cable, but I need to be able to use wifi. Help please? I am at the point of just giving up and going back to Vista, really frustrated.