From Mary Landesman,
Achieving good computer security can seem like a daunting task. Fortunately, following the few simple steps outlined below can provide a good measure of security in very little time.
Use antivirus software and keep it updated. You should check for new definition updates daily. Most antivirus software can be configured to do this automatically.
Install security patches. Vulnerabilities in software are constantly being discovered and they don't discriminate by vendor or platform. It's not simply a matter of updating Windows; at least monthly, check for and apply updates for all software you use.
Secure your browser. If you use Internet Explorer, you will be able to take advantage of the security zones settings to ensure optimum browsing safety. Not only will you enjoy safer browsing, you'll be able to eliminate unwanted pop-ups as well.
Take control of your email. Avoid opening email attachments received unexpectedly - no matter who appears to have sent it. Remember that most worms and trojan-laden spam try to spoof the sender's name. And make sure your email client isn't leaving you open to infection. Reading email in plain text offers important security benefits that more than offset the loss of pretty colored fonts.
Treat IM suspiciously. Instant Messaging is a frequent target of worms and trojans. Treat it just as you would email.
Avoid P2P and distributed filesharing. Torrent, Kazaa, Gnutella, Morpheus and at least a dozen other filesharing networks exist. Most are free. And all are rife with trojans, viruses, worms, adware, spyware, and every other form of malicious code imaginable. There's no such thing as safe anonymous filesharing. Avoid it like the plague.
Keep abreast of Internet scams. Criminals think of clever ways to separate you from your hard earned cash. Don't get fooled by emails telling sad stories, or making unsolicited job offers, or promising lotto winnings. Likewise, beware of email masquerading as a security concern from your bank or other eCommerce site.
Don't fall victim to virus hoaxes. Dire sounding email spreading FUD about non-existent threats serve only to spread needless alarm and may even cause you to delete perfectly legitimate files in response.
Remember, there's far more good than bad on the Internet. The goal isn't to be paranoid. The goal is to be cautious, aware, and even suspicious. By following the tips above and becoming actively engaged in your own security, you'll not only be protecting yourself, you'll be contributing to the protection and betterment of the Internet as a whole.
source:about.com
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