This term refers to the condition of a file after a virus, spyware, or malware has inserted malicious code into it. Computer systems are infected if a virus or Trojan is installed and running on that system. Static malware, such as viruses and Trojans with entirely malicious code, is also said to be infected. If a potentially unwanted program is installed on a system, the system is not considered infected, even though there may be other consequences.

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