Windows 7 Firewall
The Windows 7 Firewall screens data coming from the Internet or a network, and then either blocks it or allows it to pass through to your computer, depending on your firewall settings. The Windows 7 Firewall can help prevent hackers or malicious software (malware, worms) from gaining access to your computer. A firewall can also help stop your computer from forwarding malicious software to other computers. They are of particular importance for users who have "always on" connections such as cable or DSL modems. Firewalls come in two flavors: hardware (external) and software (internal). Both have their advantages and disadvantages. - Hardware - These external firewall devices are placed between your PC and your cable or DSL modem. Some Internet Service Providers (ISPs) offer "routers" that include firewall features. Hardware-based firewalls can protect multiple computers or only one computer. The biggest negative for hardware-based firewalls is cost, even though there are products available for less than $100.
- Software - Some operating systems, such as Windows XP, Windows Vista, and Windows 7 include a built-in firewall. If you have an "always on" internet connection you should enable your built-in firewall as another layer of protection. If you don't have the built-in variety you can purchase or download a software firewall product for little or no cost.
Even though a firewall alone does provide some protection, it should be considered only part of an overall security strategy that includes anti-virus software, anti-spyware, and a backup plan.
The Windows 7 Firewall is on by default. To make sure it hasn't been turned off, follow these steps: - Open Windows 7 Firewall by clicking the Start button, and then clicking Control Panel. Find the Windows Firewall icon and click on it to open it.

- In the left pane, click Turn Windows Firewall on or off. Enter the Administrator password If you're prompted.
- Click "Turn on Windows Firewall" below each network location type, and then click OK. The Firewall should be on for all network location types.

For most home users, as long as the firewall is on and set to the default settings, you should be protected. However, some programs might require you to allow them to communicate through the firewall in order to work properly. To allow a program to communicate through the Windows 7 Firewall, click the Start button, then click Control Panel. Locate the Windows Firewall icon and click on it. In the left pane, click "Allow a program or feature through Windows Firewall". 
Click the Change settings button. If you're prompted for an administrator password or asked for a confirmation, enter the password or OK the confirmation. Select the check box next to the program you want to allow through the firewall, and the appropriate network locations (home or public), then click OK.
Remember, each time you choose to allow a program to communicate through your firewall, your computer will become less secure. The more items you allow through your firewall, the more at risk you become to hackers or malicious software (malware).
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