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• Press Win+R.
• Type firewall.cpl and press Enter.
• In the firewall window, select "Advanced settings".
• In the left menu, select "Outbound rules".
• Click the "Create rule" button.
• Select "For a program" and click "Next".
• Click "Browse" and find the executable file of the program whose network access you want to block.
• Check the box next to "Block connection" and click "Next".
• Select which profiles (home, work, public) the rule should apply to.
• Click "Next".
• Enter a name and description of the rule for convenience.
• Click "Done".
The selected program will now be blocked from accessing the network.
• Before blocking a program, make sure you understand its functions and that blocking it will not disrupt the operation of other applications.
• If you encounter problems after blocking a program, you can always delete the rule you created.