WHAT IS A COMPUTER VIRUS?

A computer virus is an unwanted program that invades your computer and, usually, results in problems which can range from a slowdown to making your computer unusable and irretrieveable destroying all files on your hard drive.

HOW DOES MY COMPUTER GET A VIRUS?

Back in the early days of computer viruses (viri?), before the internet and networks, viruses were spread by diskettes (aka floppy disks or floppies). Early anti-virus programs scanned all diskettes when you put them into the computer, and notified you whenever a virus was found, so that you would not copy that file, or files, onto your computer.

With the advent of the internet, blackhat hackers (not all hackers are bad) found a better way to spread their nasty creations. Although viruses can be still be spread from computer to computer via floppies and CDs that you receive or create, this is relatively uncommon nowadays.

HOW CAN I KEEP MALWARE OUT OF MY COMPUTER?

The bottom line is to use the best antivirus programs available. The most common ways that viruses now spread are through email, or downloading infected files from a website.

So how do you determine the best program. The first thing to do is research. Most antimalware testing appears to be done by magazines, although there are some independent labs that also do testing. AV-COMPARATIVES (www.av-comparatives.org)is an independent lab that performs anti-malware program testing exclusively. If you're interested, in seeing the results, go to www.av-comparatives.org. From there you can see a summary of test results by clicking on the Whole Product Dynamic Test link in the Latest Results panel on the web page.

But if you're not inclined to spend the time to do your own research, I'll give my recommendation for your consideration. The internet security programs that consistently come out at the top of testing are BitDefender, Kaspersky, and Norton.

Bit Defender www.bitdefender.com has been my preferred program for a few years, becasue it seems to be the least intrusive, just quietly doing its' job and rarely asking questions about choices.

Free antivirus programs generally receive scores that are 10% or more below the top programs in testing. They are certainly better than no virus protection, but would you accept a flu or tetanus vaccine that was less than 90% effective? Also, there are very few free internet security suites available. BitDefender, Kaspersky and Norton all have free anti-virus programs at the time I am writing this. These are the anti-virus engines in their paid versions, but without the added features such as a firewall, spam filtering, and so forth.

KEEP YOUR VIRUS DEFINITIONS UPDATED

Anti-virus software publishers spend a lot of time researching viruses and keeping up on the latest variants. They publish updated virus definitions, usually about weekly. If you don't keep your virus definitions updated, the programs cannot protect you against the newest variants. Most anti-virus programs are licensed by the year, which includes upgrading to the newest version of their program when it is updated. Where things fall apart is when users get too cheap to renew the contract, or don't bother to register their program. Without registering and having a current subscription, anti-virus programs cannot download the newest virus definitions, and cease to protect your computer.

Although backing up your data is an important security step, your backups may have virus files on it and restoring your data after a particularly nasty virus trashes your computer, just puts the virus back on your computer. So pay a few bucks and make sure your anti-virus subscription is current.

When it comes time to renew your anti-virus program's subscription, if you shop carefully. Some clients have told me that they wait until a rebate is available and then buy the newest version of the software - complete with a 1-year subscription - for less than the cost of the annual subscription fee, after rebates. Keep your eyes and ears open.