Computer first line of defense.(ONLINE SURVIVAL GUIDE)(Buyers Guide)

Security might not be foremost in your mixed when you're shopping for a computer, but it should play a part in your decision. Your choice of hardware and software can affect your ability to deflect intruders and defend your data.

Viruses and spyware are far more likely to target Windows PCs than Macs. It's too soon, to know, however, whether new Macs will be more vulnerable to attack once Apple begins its switch to Intel processors, the type used in Windows PCs, next year.

Whether you opt for a Windows PC or a Mac, you should use antivirus, firewall, and antispyware programs. Many computers include software such as Norton Internet Security or McAfee AntiSpyware, but those are often limited to 30 to 90 days of use. Upgrade and update these starter packages as necessary or replace them to maintain protection over the long haul.

HOW TO CHOOSE:

See whether upgrading your current computer will satisfy you. If all you need is more storage for, say, digital photos and music, consider adding another hard drive. You can also upgrade memory or add a DVD writer. Such efforts can cost less than $100 each and spare you the hassle of setting up a new system and moving existing data. But if your old computer crashes for no discernible reason, struggles with everyday applications, or can't accommodate new software or peripherals, it's time to spring for a new one.

Settle on a desktop or laptop. Each has its strengths. The laptops we call workhorses perform much like desktops, so they're a good option even for at-home use. A laptop takes up less space than a desktop and can easily be hidden or moved from room to room, especially if you have a wireless network.

Desktop computers generally cost less than comparably configured laptops, so the same money will buy more storage, memory, multimedia features, and expansion flexibility. (See Ratings, pages 26-27.)