Are anti-versus wares safe enough?Say there is only an antivirus software on your computer but there is no firewall to protect your security.
A firewall offers important security protection, but only if its configured properly and used appropriately. Any decent firewall should offer basic NAT protection. Beyond that, mileage may vary.For example, a permission-based firewall that gives carte blanche to Internet connecting applications will not be as effective as a firewall that seeks permission each time.Kaspersky internet security has anti-versus and firewall function,Kaspersky antivirus ware has no internet protection. If you do not want to pay for the firewall, I suggest some good free firewalls for windows.

• ZoneAlarm Free Firewall

  ZoneAlarm Free Firewall offers two-way firewall protection combined with customizable application level access permissions.A top firewall in the world, great and easy to use.

• Comodo Personal Firewall

  Comodo firewall offers a wide range of features – so much so that it may overwhelm casual users and cause conflicts with other installed security software.The free Comodo Firewall download includes antivirus, but the protection offered by the antivirus program is mediocre at best.

• Outpost Firewall

  Agnitum Outpost Firewall Free provides a basic two-way firewall with standard packet and application filtering. Supports Windows XP and Vista.

• Sunbelt Personal Firewall

  The free version of Sunbelt Personal Firewall offers only incoming packet filtering – to get bidirectional protection you’ll need to upgrade to the Pro version.

At last, the ZoneAlarm Free Firewall is my choose.