How can you hack someones computer without connecting to internet

Hello,my computer was hijacked. administrative choices were no longer mine,nothing was working.all programs and system utilities were being altered. all firewall settings were system tools did any good and mostly didnt even respond. i never was on the internet. i have a wireless phone and modem in my house,but i never logged on.this really happened i dont know who or why but there are ways to covert unused ports into receptors for wireless transmissions. the resoures are out there. this screwed my whole computer. please help me.tell me how this happened
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  1. May I ask you what OS are you using? It helps me to put this into a more appropriate section of the forum.

    TBH, I have no idea on what exactly happen (we can only guess). But I would say your computer is not as isolated as you think. You can still get infected by accessing movable media and I think this is the most likely source of this infection. Because the computer seems to be mostly unusable, I recommend you to reinstall Window and install security software.

    Reinstall Window and go to:

    Check the section "Antivirus and Antispyware" and "Free Firewalls". Download and use the software to protect yourself.

    I use Avira, Spybot S&D with Comodo firewall.

    You should also read these if you have time:
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