I need to help protect my computer firewall

You should do three things:

1. Turn on Windows automatic updating and make sure that updates are automatically installed on your computer. For more information, see Change how Windows installs or notifies you about updates.
2. Get a good antivirus program and keep it up to date by regularly downloading updates from the program manufacturer's website. Many antivirus programs update automatically. For more information, see How can I help protect my computer from viruses?
3. Use Microsoft Windows Defender or another antispyware program. These programs can help protect your computer from spyware and other malicious software. For more information about Windows Defender, see Using Windows Defender.