What free defense software is there?

Comodo Personal Firewall: Comodo classifies more than 10,000 applications into security, spyware, adware, etc., which can greatly simplify the management of firewalls. All you need to do is ** it for free.

SoftPerfect Personal Firewall: This firewall supports multiple network configurations and has a flexible filtering system, all for free.

ZoneAlarm: It offers a free basic firewall service that includes scanning incoming and outgoing data traffic.

WebRoot Desktop Firewall: It prevents remote Trojans from hijacking a user's computer. Now compatible with Vista, it has a robust multi-layered defense system, including a desktop firewall, port management, URL filtering, and process monitor, as well as detecting abnormal application and system behavior.

It used to be $20, but now it's free.

There is no optimum, just raise awareness of security.

I recommend you to use Kaspersky, if you have less than 200MB of memory, then forget it, then you can use Micropoint, it feels good, this is active defense software, if you use Kaba plus 360 then the effect will be very good!

360 Security Guard.

Personally, I think Rising 2008 is very good, basically can remove viruses, if it prompts that it needs to be decompressed to kill the virus, you can do it in the virus file managed by Rising Antivirus, right-click on the virus file, open the directory, and delete the file directly and manually, that's the installer, so Rising can't be automatically deleted. Safety Recommendations:

Install genuine anti-virus software, personal firewall and card Internet security assistant, and upgrade them in a timely manner, Rising anti-virus software is upgraded at least three times a day.

Use "Rising System Security Vulnerability Scanning" to patch and make up for system vulnerabilities.

Do not accept suspicious files from QQ, MSN, EMIAL, etc.

Turn on the real-time monitoring function of the antivirus software when surfing the Internet.

Add important software such as online banking, online games, and QQ to the "Rising Account Vault" to effectively protect the security of passwords.

Hope it helps!

If you know more about computers, you can use 360 security guard, little red umbrella, plus comodo firewall, this is a very good combination, if you are still a computer novice, you can use 360 security guard, plus 360 antivirus software, you can meet the needs of protecting computer security! Of course, no matter what system security software you use, the most important thing is to have a good online habit!

There's no best in this.,What's right for you is the best.,Look at a lot of computers around are installed 360 protection software.,This function is still quite stable.,Everyone trusts it.,You can try it.。

Defensive Kill Soft NOD32 deserves to be the first in the world, and its advanced heuristic antivirus, until now, no Kill Soft can surpass it (in terms of Defensive Kill Soft).