Instructions to Update Microsoft Security Essentials to the Latest Virus and Spyware Definitions

  1. Double-click on the Microsoft Security Essentials logo (located in the taskbar, near the clock, and typically in the lower-right hand corner of the screen).
  2. Click the Update Tab.
  3. Click the Update button to manually force an update.
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  1. Go to Start, click All Programs, and select Microsoft Security Essentials.
  2. Click the Update Tab.
  3. Click the Update button to manually force an update.

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Visit Microsoft's site to manually download and install definitions.