Anti-virus software

hello,
i would like to know some of your opinions re: use of anti-virus software for mac. until now i never used any. i never had a problem with viruses & else. two weeks ago, i had a bad experience while using netscape browser: lost important data (all passwords, usernames, personal info; favorites; more).my laptop computer started to freeze frequently. maybe the problem is not virus related. but a few days ago, i read some article concerning the appearance of viruses made for mac. if any of you has a suggestion as far as the use or not of such software? if yes, which one would be best. i heard mcAfee is very decent...
my computer:
Machine Name: Mac Pro
Machine Model: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 2 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP11.005C.B01
in advance, i thank you
sandrine
powerbook G4   Mac OS X (10.4.8)  

There have been attempts at mac virus's, however, there aren't any credible mac virus threats today.
You want to be sure the included OS X firewall is enabled, including it's stealth mode. Next, you may want to run an antivirus program, as a preventative and for peace of mind, and perhaps to stop spreading any virus's to your windows friends.
I use ClamXAV, which is available in universal version from http://www.clamxav.com . I have it scan my email (has warned me about phishing emails) as well as any downloads. There are other commercial antivirus packages made by Intego (Virusbarrier) and Symantec (Norton) for the mac environment. McAfee has all but bailed out of the individual system mac environment. Apple stopped using them on .mac, as there were significant Tiger issues early on.
The above assumes you're not running bootcamp and Windows. If you are, then you need to consider antivirus software for the Windows environment. In the Windows environment, there are many antivirus vendors, and you can probably catch some recent reviews from PC Magazine and others. McAfee does make a decent antivirus program for the Windows environment. I'd probably stay away from Norton, as I've read some comments that recent releases are perhaps getting too complex. If you watch Staples ads, they now and then have various Windows antivirus software for free after rebates. Best Buy recently had McAfees antivirus for Windows for $2 after rebates.

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    Any website that prompts you to install a “codec,” “plug-in,” "player," "extractor," or “certificate” that comes from that same site, or an unknown one, is untrustworthy.
    A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. (Some reputable websites did legitimately warn visitors who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
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    In order to meet that nonexistent threat, the software modifies or duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability, bugs, and poor performance.
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    This comment applies to malicious software ("malware") that's installed unwittingly by the victim of a network attack. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an attacker who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
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    It can be disabled or overridden by the user.
    It can be bypassed by some third-party networking software, such as BitTorrent clients and Java applets (see below.)
    It only applies to applications downloaded from the network. Software installed from a CD or other media is not checked.
    For more information about Gatekeeper, see this Apple Support article. Notwithstanding the above, the most effective defense against malware attacks is your own intelligence. All known malware on the Internet that affects a fully-updated installation of OS X 10.6 or later takes the form of so-called "trojan horses," which can only have an effect if the victim is duped into running them. If you're smarter than the malware attacker thinks you are, you won't be duped. That means, primarily, that you never install software from an untrustworthy source. How do you know a source is untrustworthy?
    Any website that prompts you to install a “codec,” “plug-in,” or “certificate” that comes from that same site, or an unknown one, is untrustworthy.
    A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. [Some reputable websites did legitimately warn users who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.]
    “Cracked” copies of commercial software downloaded from a bittorrent are likely to be infected.
    Software with a corporate brand, such as Adobe Flash Player, must be downloaded directly from the developer’s website. No intermediary is acceptable.
    Java on the network (not to be confused with JavaScript, to which it's not related) is always a potential weak spot in the security of any operating system. If a Java web plugin is not installed, don't install it unless you really need it. If it is installed, you should disable it (not JavaScript) in your web browsers. Few websites have Java content nowadays, so you won’t be missing much. This setting is mandatory in OS X 10.5.8 or earlier, because Java in those obsolete versions has known security flaws that make it unsafe to use on the Internet. The flaws will never be fixed. Regardless of version, experience has shown that Java can never be fully trusted, even if no vulnerabilities are publicly known at the moment.
    Follow these guidelines, and you’ll be as safe from malware as you can reasonably be.
    Never install any commercial "anti-virus" products for the Mac, as they all do more harm than good. If you need to be able to detect Windows malware in your files, use the free software ClamXav — nothing else.
    Why shouldn't you use commercial "anti-virus" products?
    Their design is predicated on the nonexistent threat that malware may be injected at any time, anywhere in the filesystem. Malware gets into the system by being downloaded, not by materializing from nowhere.
    In order to meet that nonexistent threat, the software duplicates low-level functions of the operating system, which is a waste of resources and a common cause of instability and poor performance.
    By modifying the system at a low level, the software itself may create vulnerabilities that could be exploited by malware attackers.
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