"Male. Obsessed with computers. Lacking a girlfriend. Aged
14 to 34. Capable of making chaos worldwide."

The above description is the profile of the average computer-virus writer, according to Jan Hruska, the chief executive of British-based Sophos PLC, the worlds fourth-largest anti-virus solutions provider.

"They have a chronic lack of girlfriends, are usually
socially inadequate and are drawn compulsively to write self-
replicating codes. Its a form of digital graffiti to them,"
Hruska added.

To create and spread cyber infections, virus writers explore
known bugs in existing software, or look for vulnerabilities
in new versions.

With more and more new OS (operating system) versions, there
will be more new forms of viruses, as every single software
or OS will carry new features, and new executables that may
be carriers of the infection.

Executables are files that launch applications in a
computers operating system, and feature more prominently in
new platforms like Microsofts Windows 2000 and Windows XP
than they did in the older DOS or Windows 3.1.

Virus writers also share information to create variants of
the same infection, such as the Klez worm, which has been
among the worlds most prolific viruses.

The Klez, a mass-mailing worm that originated in November
2001, propagates via electronic mail using a wide variety of messages
and destroys files on local and network drives.

But the news gets worse. Recent events have uncovered what
can be a new trend: spammers paying virus writers to create
worms that plant an open proxy, which the spammer then may
use to forward spam automatically. Many suspect this
occurred with the SoBig virus.

The Sobig worms, began spreading in the early part of
2003. The unusual thing about them was they contained an
expiration date and we are given a short life cycle to see how
features worked in the wild.

Having an expiration date also makes the virus more
dangerous, because most everybody would have been alerted to
the new worm within a few weeks and anti-virus definitions
would have been updated.

A variant of Sobig, Sobig-F was so effective that just a few
infected machines could send thousands of messages. Sobig-F
created a denial-of-accomadation effect on some networks, as e-
mail servers became clogged with copies of the worm.

According to Mikko Hypponen, manager of anti-virus research
for Finland-based F-Secure Corp, Sobig-F sent an estimated 300 million copies of itself.

Computer Economics, Inc. states, "Nearly 63,000 viruses have
rolled through the Internet, causing an estimated $65
billion in damage." However criminal prosecutions have been
few, penalties light and just a handful of people have gone
to prison for spreading the destructive bugs.

Why is so little being done? Antiquated laws and, for many
months, as crazy as it sounds, a "wink, wink" or even admiring attitude toward virus creators.

One person has been sent to prison in the United States and
just two in Britain, authorities say. But the low numbers
are "not reflective of how seriously we take these cases,
but more reflective of the fact that these are very hard
cases to prosecute," said Chris Painter, the deputy chief of computer crimes at the U.S. Department of Justice.

So what can you do to protect yourself against computer viruses?

Well, first and foremost, make sure you have proven anti-virus protection like like Symantecs Norton Anti-Virus or McAfees ViruScan.

In addition, If you havent already done so, I highly recommend installing Microsofts Service Pack 2. SP2 tightens your PCs security with a new Windows Firewall, an improved Automatic Updates feature, and a pop-up ad blocker for Internet Explorer. Plus, the newly minted Security Center gives you one brain friendly-to-use interface for keeping tabs on your PCs security apps.

"Male. Obsessed with computers. Lacking a girlfriend. Aged
14 to 34. Capable of building chaos worldwide."

Now, Im no psychiatrist, but to me, the above description
sounds more like someone with a few "bats in the belfry!"