It is critical to make sure that your computer is running software that protects against malicious software. Malicious software, which includes viruses, spyware, or other potentially unwanted software can try to install itself on your computer any time you connect to the Internet. It can also infect your computer when you install a program using a CD, DVD, or other removable media. Malicious software, can also be programmed to run at unexpected times, not just when it is installed.

Microsoft Security Essentials offers three ways to help keep malicious software from infecting your computer:

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