Microsoft gives many feature inbuilt one of this is Windows Firewall .It is free and comes with all Windows version.windows firewall protect your PC from unwanted attack .It is also useful to block a certain program or a hacker, just open up your Windows Firewall if you think how is this possible then simply follow the steps below.Step:1) first of all you need to Open the Firewall in Windows 8. While on the Start screen, type firewall and select Windows Firewall option . Alternatively You can click on Settings and select Windows Firewall.
Blocking a Program with the Firewall
Open the Firewall in Windows 7/Vista/XP. Click the Start menu and select Run. In the Run box, enter firewall.cpl and then click OK. You can also access Windows Firewall from the Control Panel.
Step:2) Click the “Allow an app or feature through Windows Firewall” link. It may be called “Allow a program through Windows Firewall”. This will open a list of programs with check boxes next to them.
Step:3) After that Click the “Change settings” button. In order to be allowed to adjust the settings, you may need to click the “Change settings” button. If a password is required, enter it now.
Step:4) Now you need to Uncheck the box of the program which you want to block. When the box is unchecked, the firewall will block it from connecting to the internet.
Note: If you’d like the program blocked when connected to a Public network but unblocked on a Private network, or vice versa, check and uncheck the appropriate boxes to the right of the program listing.
Checking boxes will allow the program to access the internet. Only allow those programs which have good reputation in market or you trust.
Step:5) now you have almost done ! for successfully block any program Save your settings. Once you’ve finished making changes, click the OK button to save your Firewall settings.
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