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A firewall is a software program or piece of hardware that blocks hackers from entering and using your computer
install a well known antivirus software, actually you can find it online.
To install one of top ten antivirus & Internet Security into a PC according to meet specification which is protect to your computer from hackers. . . I strongly recommended is Kaspersky Internet Security. You can download demo version from website.
I would recommend to use Best Firewalls configuration for outgoing and incoming connections and A good antivirus like bit defender with a frequent update of antivirus and OS.
Hello Ibrahim ,
Always keep your OS patched and with Latest Anti virus. One more thing try to keep away from the thing which you will get in free on internet. Some time Hackers put some malicious attractive file on internet to attract user to download . once you download it will start it's working