Somebody got hold of all the details of my router (everything you can think of) and has since been able to see everything I do and type. They are also able to remotely control my computer, and control devices. I believe they may be using MAC or ARP spoofing. I ran XARP and it detected an ARP attack but I don't really understand the details. It's all guesswork at this stage. Is there any way I can stop this person doing any of this? Remote assistance is disabled. They are able to do it when I am connected via wifi or a LAN cable. Any help would be sincerely appreciated.