It is important to work to keep your computer clean and free of all types of malware, which include viruses, spyware, and adware. Malware in general is bad in that it can effect the computer and can also effect the user. For example, many types of malware work to steal personal information from your computer through the use of keyloggers. These viruses can steal information such as passwords and credit card information, both of which should be kept safe.
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It is also important to work to protect yourself from viruses by getting antivirus protection and also installing a firewall. A firewall will help the computer keep hackers out of the computer by creating a line of defense. Zonealarm currently provides a free version of their firewall.