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Reboot for a Safer Computer
Many parts of your operating system and other software installed on your computer "phone home" for updates when your start your computer. These updates may be installed to the program file on the disk at the time of the download, but may not be installed to whatever part of the program is loaded in memory. In order for that to happen, your computer must be rebooted. Other updates are cached when downloaded and are installed at shutdown or at the next time your computer starts up. Your computer will still be susceptible to the issue that required the update until the computer is restarted.  Thus, it is important to restart your computer on a regular basis. At least once per week is recommended.