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That new computer you just bought is a one-way ticket to hacker paradise. Here are some things you need to do to shore up those security holes and build a defensive moat around your computer.

Update to the latest security patches. If your computer runs any version of Windows, you're at risk. Be sure to visit the Windows Update site, choose Product Updates, then download and install any critical updates noted for your system. You should check for critical updates monthly.
http://windowsupdate.microsoft.com

Make sure file extension viewing is enabled. By default, Windows comes with file extension viewing disabled.
How do I enable file extension viewing?

Keep your email honest. Email can do more than just send a friendly greeting. Because it is capable of running certain types of code, it is capable of being infected by a virus. Disable this code in your email and you'll be on your way to a safer email experience. The Email Help Center provides information on email viruses, what security patches are required, and how to disable active scripts in email to help prevent infection.
http://antivirus.about.com/library/blemail.htm

Update your antivirus software. Most new computers come with old antivirus software. To be effective against current virus threats, the antivirus software must be updated regularly. You should update once per week on average, more often if a new virus has been discovered and is widespread.
How can I keep informed about viruses?

Put a crocodile in your moat. Hackers routinely take advantage of unprotected computers. Once accessed, they often leave behind malicious backdoor access Trojans to remotely manipulate your system. Firewall protection is designed to prevent this intrusion and is imperative for anyone one has a connection to the Internet. Even dial-up modem users are at risk, but even more so are cable and DSL users. Free for personal use, ZoneAlarm is a top-notch firewall product designed to prevent unauthorized access to or from your computer.
Download ZoneAlarm
Learn more about Trojans

One final check. To ensure there are no undiscovered security vulnerabilities, take advantage of Shavlik Technologies' free online security scanner. This handy tool checks your system for potential risks and gives you a full report complete with clickable hints and how-to's. Do this montly.
Shavlik's QuickInspector

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