Thanks for your response.  I have run this program from the command prompt. 
Is the signature update different from updating the virus definitions from 
within MSE Update?  I guess basically I am asking are there 2 database(?) 
files involved because I know the definitions get updated every morning 
because I do it manually as my first step after turning on the computer.
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"VanguardLH"  wrote in message 
news:ei8rbdFttloU1@mid.individual.net...
> Bill Bradshaw wrote:
>
>> Every once and a while the Microsoft Malware Protection Command Line
>> Utility
>
> This one?
>
>  MpCmdRun.exe
>
> It is a cleanup tool.  You'll find it has one, or more, events defined
> in Task Scheduler.  It has the following commands (with hyphen prefix):
>
> -Scan
> -Trace
> -GetFiles
> -RemoveDefinitions
> -SignatureUpdate         <---.
> -Restore                     |
> -AddDynamicSignature         |
> -ListAllDynamicSignature     |
> -RemoveDynamicSignature      |
> -EnableIntegrityService      |
> -SubmitSample                |
>                             |
>> ... uploads ...            |
>                             |
> downloads -------------------'
>
>> ... over 100 megs to this computer.
>
> It employs a signature database as do most anti-virus programs.
>
> https://technet.microsoft.com/en-us/library/gg131918.aspx
>
> Run mpcmdrun (without any arguments) in a command shell to see its own
> help on how to use it.
>
>
http://www.addictivetips.com/windows-tips/command-line-utility-mpcmdrun-exe-mic
rosoft-security-essentials/
>
http://www.windowscentral.com/how-use-windows-defender-command-prompt-windows-1
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