Windows Firewall is an easy feature to turn on or off and can help prevent hackers and worms from slithering into your computer through a network or the Internet. A firewall can also help stop your computer from sending malicious software to other computers.
Unless you have another firewall enabled, such as a corporate network firewall, you should turn on Windows Firewall to protect your computer and network (if you have one).
To turn on Windows Firewall:
Note: If your computer is connected to a corporate network, your company's group policy settings might prevent you from turning on Windows Firewall.
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