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Manually download the latest definition updates for Microsoft Security Essentials

To install the correct version of the Microsoft Security Essentials virus and spyware
definition updates, you must know whether Windows XP, Windows Vista, or Windows
7 is running in a 32-bit or a 64-bit operating environment. Additionally, you
must be logged on to Windows as an administrator. If you are not sure of your
Windows XP, Windows Vista, or Windows 7 environment type, or if you need help
verifying that you are an administrator on the computer, visit the following
Microsoft Web site:

After you verify the operating environment,
download the appropriate update version of the program. To do this, follow these steps:

1. Download the Microsoft Security Essentials virus and spyware definition update file that is appropriate for your version of Windows:
To download the file for a 32-bit
(x86-based) version of Windows, click the following link:
To download the file for a 64-bit
version of Windows, click the following link:

Note: You must be running a 64-bit version of Windows to run

a 64-bit version of Microsoft Security Essentials. 64-bit versions of Windows

include x64-based versions of Windows.

2. Click Run to install the definition update file immediately. Or, click Save to save the file to the computer. If you click Save, remember the folder where you saved the file.
3.   To install the saved file, follow these steps:
      On Windows XP:
Double-click the file, and then click OK.
On Windows Vista or on Windows 7:
     Right-click the file, and then click

Run As Administrator. If you are prompted for an administrator password or for

confirmation, type the password or click Continue.

When the definition update file runs, a file extraction

dialog box appears. The dialog box indicates that the definition update is

installing. After the file extraction dialog box closes, you can verify that

the virus and spyware definitions have been updated. To do this, open Microsoft

Security Essentials, click Update, and then examine the virus and spyware

definitions status.


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