This best way to protect your Macintosh is to regularly update your version of Mac OS X. Updating your version of Mac OS X will make your computer less vulnerable by fixing known security holes. Follow these steps to keep your system updated:
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Choose System Preferences from the Apple menu.
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Choose Software Update from the System Menu
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Click on the Check Now button.
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If Software Update finds an item to download, it appears in a list. Click on an item to get a description before downloading it. Select the items you want to install, then click the Install button.
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Enter an Admin username and password
After the update is complete, restart the computer if necessary.
Learn more about how to use Software Update.