I had the same problem. The wireless adapter just cant connect to the channel your router is on, maybe some sort of incompatibility. So all you have to do is change the channel that your router is on.
Just open up a browser from any device, and in the address bar type your ip address. Then it should ask for your login details. The username will be 'Admin' without apostrophies, and password would be the brand of your network provider, such as 'sky'.
Then somewhere in these setting you will find an option containing chanels, just change the channel and it should work. If you have sky internet then just do a number between 1 and 11.