Thanks again for your replies,each pc has wireless connection active to the router and can access the router interface. We access the internet using a username and password provided by the isp which is entered once we click on the relevant network connection icon. When we click on the connection icon on a different pc, whilst another is connected, we click to connect but it does not proceed. The error message comes up as if they cannot connect to the internet. Looks as if I may need to contact ISP to reset our username and password although I am always reluctant to involve them. They never seem to know what they are doing and I end up with them trying to get me to check the processes that I have usually carried out.