Sometimes computer users think that to keep secure a computer from any kind of problem you have to be a hacker. Instead there just 4 mininal rules to follow to get computer security:
1) install and keep updated (at least every week) an antivirus software.
There are a lot of good freeware antivirus like Avira AntiVir Personal - FREE Antivirus 10 , AVG Anti-Virus Free Edition , Avast! Free Antivirus 5.1 , etc.;
2) keep updated your browser and your operationg system .
If you want to know what Internet browser is most secure the answer is not so easy and you will get all the possible answers on the Net. Instead if you want to know what operating system is most secure, maybe the majority of answers will tend on Mac OS X and Linux ;
3) don't visit strange web-sites .
With strange I mean web-sites signalled as "not secure" by the browser, or containing a lot of web advertising, or when you don't trust about contents and links written in other languages, etc.
4) don't click on links received by email, especially if email seems to come from a big istitution (like banks, post offices, etc.) .
Also (and especially) if email come from someone you know. If you are not sure inform yourself about the sender of the email, but don't click before reading everything in the mail and in the link.
Finally remember that many security experts say:
the main security factor in a computer is user .
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