Not quite sure what to tell you, you can not get this computer online at all? What happens (messages) when you try to connect. I need more information. If you can not connect to the internet with this computer only, then it may be settings have been changed by the malware. I suggest you ask tech support at your Internet Service Provider to give you a hand, that is what they do.
I would also suggest you plug into the moden (without the router) to see if that helps. I can't make other suggestion until I know more about what is happening.
Thanks