I'd start by setting the router back to the shipping defaults. There should be a button, possibly reset, on the back. Pressing that will take the router back to the factory settings but it will also set the Administrator Log In to what ever it was originally. If you have the install disk, reinstall the router. If you don't have the manual, go on line and find it and follow the instructions
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.