Windows Firewall protects your computer from unauthorized access via the Internet. Unfortunately, many users have experienced a problem involving Windows Firewall service. In these cases, the Windows Firewall service does not start upon computer startup. This is usually indicated by a red “At Risk” icon displayed in the notification area of your operating system. By clicking on the red icon, you will see a message indicating that Windows Firewall service could not be started. Fortunately, there are three relatively easy ways to fix this problem.
Click "Start," and then click "Run." Or, if you are using Windows 7, hold down the Windows key and then press “R.”
Type "services.msc" (without the quotation marks) and then click "OK."
Double-click on "Microsoft Protection Service" from the list of services that appear.
Select "Automatic" under "Startup Type" if it is not already selected.
Click "Start," and then click "Run." Or, if you are using Windows 7, you can hold down the Windows key and press “R.”
Type "appwiz.cpl" (without the quotation marks) and then click "OK."
Click on any third-party firewall programs from the list of currently installed programs, and then click "Remove."
Click "Start" and then "Run" or hold down the Windows key and press “R” in Windows 7.
Type the following commands, pressing "Enter" after each command:
Net stop MSFWSVC
Net stop MSFWDRV
Net stop MSFWHLPR
Net start MSFWHLPR
Net start MSFWDRV
Net start MSFWSVC
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