Routers are usually the simplest things to set up Pete. I dont know your particular model but if it has a reset to factory settings button, press that and start afresh.
All you should have to do is to access the router through its IP of 10.0.0.2 as you have done, go into the WAN configuration part and put your ISPs username and password in, usually you have to tell it to save the settings and reboot the router. That should be all that is required.
If it doesnt connect after doing that then shut down the pc and turn the router off and then turn the router and pc back on and it should assign the correct IP to your PC.
Hope this sorts it for you but if it doesnt let me know if there are any lights on the router that are flashing or on or off