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#21
I would look for holes in the walls if they are seeing what you are doing .
Set your pc up with a strong password, this will stop most people from being able to remote into your pc, then setup your router to use the mac table and allow computers to access the router by thier mac, this way you can control which computers are allowed to access your network.
To find your pc mac open a command prompt (type cmd in search and run as admin) and then type ipconfig /all and enter, you will see a bunch of stuff listed, look for the "Physical Address" entry and you will see 6 set (12 numbers/letters; 00-B2-34-4C-DF-1A for example), this is your mac affress and what you will want to put into your routers mac table.