SoftPerfect Personal Firewall

The SoftPerfect Personal Firewall is a free network firewall designed to protect your PC against attacks from the Internet or via a local area network. SoftPerfect Personal Firewall offers customizable security using user-defined rules for packet filtering.
To put it simply, like other firewalls, it blocks malicious intruders and software from attacking your computer or sending out data without your permission. Compare to Zone Alarm, Norton, or McAfee.