Thanks for your replies yes I'm trying to reconnect via ethernet and yes it worked previously but I now cant get the setup window to change anything as it won't respond to 192.168.2.1 which the handbook says is the base address after a factory restore.
Have saved the previous setting but can't restore them until I can log into the Router again.
The most likely cause - assuming that the router is otherwise functional - is that your PC has not been able to acquire an IP from the router's DHCP server. It is possible that either the server has not initialised for some reason or the DHCP Client service is non-functioning. Your next step is to run services.msc and check the status of the DHCP Client service. Also enter ipconfig /all from a command window and see what you get. Post the results here.