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Although it may seem obvious, something as simple as placing password protection on computer systems can eliminate the threat of many types of malware.
Computers or networks without passwords (unsecured networks) are very easy for 'hackers' or malware creators to access and use to spread more malware.
The harder it is for unwanted programs to access a computer system, the less likely it will be the subject of an attack.

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Using the latest virus definition an antivirus can tell if a file is malicious or suspicious.
However sometimes the software sees viruses in files that do not really have viruses. This is called a false positive. The antivirus software will sometimes remove files from the computer that should not be removed. This may cause other programs to not work properly.

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Although unable to prevent every kind of attack, if kept up-to-date, antivirus software can prevent malware accessing a computer system.
An antivirus can actively scan a computer for malware as well as websites immediately before they are opened. If found the software can either block access to infected websites/files, or remove the malicious software from the system.
Installing more than one antivirus is not a good idea as the 2 different antivirus software can interfere with each other.

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A human firewall

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Much like when someone wants to keep physical things out by building a wall, so can the same principle be applied to networks. Although a more accurate metaphor would be comparing a firewall to a guarded gate through which all network traffic must go through.
If in doubt, build a wall to keep it out.
A Firewall monitors network activity and, acting on pre-set guidelines, blocks suspicious activity.

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Unfortunately computer infections cannot be treated as simply as those that affect humans.

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Malware, as it says in the name malicious software, damages computer systems and affects them negatively. Worms, viruses, trojans, spyware etc. can have an effect ranging from nuisance to major system security or stability threat causing systems to become inoperable.
As a result of the persistent threat malware poses to networks and computer systems, many methods of preventing or removing such menaces have been developed.