With the onslaught of computer hackers, scammers, and viruses that are prevalent around the Internet, it is important to know how and why you should install a firewall. Defense from malicious data harming your computer is provided by a firewall. With one, you can avoid dangerous attacks that can wipe out your data or steal personal information.

Determine the type of firewall required by your computer as there are a wide variety available. Chances are that your firewall is already set up and ready to be used if you have a computer that came installed with the Microsoft XP or Vista operating system. You must check that it is turned on and working properly.

If you have one of the earlier operating systems, you will need to purchase your own software. Even with Microsoft XP, you may still want to purchase separate firewall software since the XP version doesn't get great reviews.

There are many products available, including as the most popular - Norton, AVG, and McAfee and you can either visit a store that sells computer software or download a firewall product through the Internet. Prices vary depending on sophistication of the software, but there are also plenty of low cost versions available, even from the big name companies.

You need to take a few things into consideration prior to installing your firewall. The program must not stop you using the functions that you need, such as file and printing sharing. This is normally done during installation but can also be done later by using the documentation provided to change the settings.

Firewalls can limit access to certain parts of the Internet. If you use a local area network or a router this may happen, so you should be aware how you connect. Secured networks are particularly difficult to access when you have a firewall installed. If you work from home or connect to a company computer, you need to coordinate with the IT department in your company before installing a firewall since they may have specific instructions concerning how to configure its settings so you are still able to connect to them.