Windows 7 - Hacked

Okay, so I recently suspected my network of being hacked, then I got messages in the form of a .txt file and, well now I am sure its hacked. I tried tracing the txt file to see were it is coming from, but i keep getting my little brother's computer, and i know its not him because well, his 5. Any help?

check the firewall settings in control panel

its being managed by Norton firewall. What exactly would I be looking for?

to update, whoever is doing this has sent me personal pictures of myself that i had deleted, and keeps sending me messages in .txt files that usually read

XD You suck ass!

Can I track these .txt file further, because they just point to my brothers computer, is it possible that he is using my brothers computer as a proxy? if so can I do anything, my little bros computer has no AV...

Also we are on a home network with 2 other computers, both of which I have access to. Also they have sent messages to all four of the computers, and gone as far as stealing personal pictures of my sister, and threaten to post them on her facebook. She took her laptop to bestbuy, to see if the qeek squad could track the invader... and they charged her $200, I have a feeling the ripped her off, but im interested in finding them myself.

Open Task Manager, make sure "Show processes from all users" is checked (it's near the bottom) and post a screenshot here. If it won't all fit on one window post two of them so we can see it all.

You might also do Start>>type in msconfig in the Search box, go to the Startup tab and post a shot of that, too.

okay i attach the screen shot, I should also point out that I just recently changed the security key on my network and the attacks have stopped, but should I still be worried?

I don't see anything on that screen which sets off an alarm. If changing your security key brought the problem to a halt it was probably someone who got into your system because there was a "door" open for them, not because they broke in.

I'd run a couple security scans like Malwarebytes, etc. I'd also recommend you visit this site: https://www.grc.com/x/ne.dll?bh0bkyd2

Click "Proceed" and then run the "Common Ports" scan. With your router set properly you should see "Stealth" for everything unless you know that you are the one who opened that port and you know you did it for a good reason.

PS:

This is what mine looks like when I did the "All Service Ports" scan. It means that as far as the rest of the world is concerned I am not even here.

Come to think of it, that's kind of like the way it is with me and girls, too...

Lol, I know all to well, about the girls lol

Well, I did everything that was asked, and everything came up good, so i was wondering what exactly, did my sister pay $200 dollars from. Where are they going to trace the .txt files? dam will they be able to give us a name?

Where were the text files showing up on your computer, as in, what file location?

Literally, on my desktop, I would log in, and right in my face next to my fallout 3 icon