After a Windows 8.1 automatic update yesterday my other wireless devices like smart phones, tablets, etc can't use my routers wireless signal unless my laptop is turned on

Hi guys, please help, I'm desperate.

After an automatic update to my windows 8.1 yesterday none of my other other wireless devices like smart phones, tablets, etc. can join my wireless network unless my laptop is turned on.  If I turn my laptop off, after a couple of minutes my iphone, my wife's iphone  and my Galaxy Tab lose connection and are unable to join my router's network. When I turn my laptop back on, all the other devices are able to use my router's wireless internet without any problems.  How can I fix this???

Thanks.