Computers -- one minute they’re working perfectly, and the next you’re staring at a blank page with a virus alert. There are so many viruses and other malicious programs on the Internet today that one wrong click on the wrong site will have you needing emergency IT support. While there are literally thousands of different viruses out there, they can be classified into different types depending on their origin and purpose, among others. Here are a few of these virus types: Resident Virus – This virus commonly disrupts and corrupts your files and programs. It is a permanent virus that stays in your RAM memory. Overwrite Virus – This is less disruptive than a resident virus, but is just as inconvenient. This virus deletes the information on your files and overwrites itself on it.
http://www.officepcs.com.au/blog/reliable-it-support-protects-your-pc-from-common-malicious-programs
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