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In today's rather anarchic net it can be difficult to tell if your files are safe. They can be compromised by a virus, a small program that can attach itself to other software, and replicate itself, spreading the infection to any computer that uses the contaminated software. Viruses can do various things, from making a system file keep growing until you don't have any free space left, to making MS Word unable to save, to even damaging your hard drive. Viruses must either be run or opened (for MSWord macro viruses only), just downloading the program cannot spread or activate them. The programs listed here provide scanning and cleaning for viruses. Some scanners sit in memory and scan all incoming files and others watch your system for the symptoms of viruses. Others offer "on demand" scanning, telling you when and where to check files. New viruses are detected all the time, so your best bet is to make sure that you update your virus checkers on a regular basis.
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