Re: 192.168.0.1 isnt working
You can find the exact default IP Address for your particular router by looking up the model number on the manufacturer's web-site; support section.
If this IP address fails, then chances are high that someone (whether legit or not is the question) has changed the default IP Address to something else. (This is a very good idea in terms of Security and is recommended.)
Routers can be hard "reset" usually by holding down a small recessed button on the back the router. Sometimes you need a needle or toothpick in order to hit the button. Router reset instructions are also available in the manufacturer's support section on-line.
It should be noted that when a Router is reset, ALL configuration for that router is lost to include firewall rules, etc...
Sometimes firewalls have custom configurations in order to connect online, and reseting a router without having the ability to re-configure it properly will result in it being unable to connect to the internet.
Exersize extreme caution.