I've spent a great deal of my life understanding computers, and one thing that has never changed is that there are rodents out there who enjoy causing pain and suffering through computer viciousness. Back in the beginning the main ones were viruses and trojan horses (time-delayed viruses essentially). There were a number of other things (like "worms") but they dropped out of the dictionary because nobody understood them anyway. Sadly, people are still doing it and are getting vastly better and more devious than ever before.
Sony suffered a major attack this past week, when a group called *G.O.P* (not the political party) stole 5 movies and threw them out to the Internet. Then there was Stuxnet which the United States intelligence community deployed into the Iraq manufacturing sector and destroyed a bunch of equipment. Now the FBI has issued a severe warning about destructive malware. The supposedly invulnerable "Blackphone" has already been successfully hacked.
So, what can be done? First, don't click on any web advertisements (unless you are sure they are what they appear to be). Second, arm your computer with some form of anti-virus (Malware Bytes & Spybot are free, but there are many other fine one to purchase). Third, be aware that threats are out there and be cautious. Fourth, do not click on any emailed links unless you absolutely trust the email's sender (even then, examine the link's address and make sure it goes where it says it does). It's ridiculously easy to spoof a link, so err on the side of caution.
I hope these tips help you out. There are lots more things to do, but awareness is where it all starts. If you want to know more, Microsoft has an excellent site: http://www.microsoft.com/security/pc-security/protect-pc.aspx.
- M
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