Here is some firewall installation tips that makes easy to install a firewall

Firewalls can be hard to uninstall. Spyware, adware, and hack attacks can try to alter or remove your firewall from your system, so firewall vendors make the programs stick to it. The best way to remove a firewall is to use the Add Or Remove Programs feature in the Windows Control Panel because it triggers the firewall’s builtin removal process. If the Add Or Remove Programs feature doesn’t work, consult your users guide or vendor’s Web site to see if there are different ways to remove the software. For instance, you can remove certain McAfee programs, including the McAfee Personal Firewall Plus, with a program called the McAfee Removal Tool that you can download from www.mcafee.com.