If someone is trying to hack your computer ...How to prevent this?

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What are the steps you should do to prevent yourself? I had a server attacking my computer constantly and constantly and it just doesnt stop...it really stuppid... why? i mean it isnt that i have something important on my computer, cause i dont ... not even a bank account lol... but wondering why is my computer so interesting? That i have constantly trojans and ppl hang up my computer when i try to do something... and also do stuppid things... like mouse stops for nothing,what can i do to prevent this kind of thing? I do have a firewall, antivirus but ... it just dont stop... i iliminate the whatever virus,trojan and it still comes... for more then 1 year that this bugthing does happen... any clue anyone?