If you researched here on AllDeaf using Search engine. You will find several posts that I made. There is NO SUCH THING AS FOOL-PROOF Security on the computer connected to the Internet.
The safest way is never connect to Internet, and never share the file with anyone, including USB memory stick, floppy drive, etc. But to achieve that, it is nearly impossible these days.
Simple is, being vigilant and use common sense. If you get E mail from a bank that needs to update information... That's RED FLAG! Banks don't don't do that. They usually will call you and ask you to come in branch to clear up issues which is rare, really.
For example, see here
http://www.alldeaf.com/introduce-yourself/113275-hello-ny.html
That OP made only 1 post so far as of this time. That person have not made second post as of yet. I don't know who this person is, they claimed to be 13 years old blue eye blonde girl. I suspect the OP original intention was trying to find pre-teen or teen boys to kidnap and rape them and their true identity might be 40 years old guy unclean shaven, living in mobile home in middle of nowhere. If that is the case, I suspect his intention was to try to befriend with somebody here though PM, and set up trap. Is that possible? You can bet my ass on it cause it had happened in the past (Not just this forum but other forums too), and will happen again no matter what. I am not saying that this OP is fake, but just saying it does not sound right, don't fall for it.
There are many many ways for hacker, and in middle hacker and master hackers to collect information and try to prey on victims. Remember, whenever it sounds too good to be true, then probably it is.
So, just be careful, and don't fall into trap.