Windows Defender wont Update: Connection Failed

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ModMonster

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Aug 31, 2015
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I keep having this problem. I can't seem to fix it. I already reinstalled .NET Framework and it did nothing. Windows 10 Update gives me this error: Error 0x80070643.

When I update Windows Defender Definitions its goes loads a few times and says: Virus and spyware definitions: Connection Failed. Please help and share your knowledge on this! Thank you
 

ModMonster

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FIX: I was able to fix this by opening CMD as Admin and typing (with quotes):

"%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe" -RemoveDefinitions -All

Then I typed (with quotes:

"%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe\" -SignatureUpdate

Hope this helped!
 

Benjamin_BG

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Dec 4, 2015
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Thanks, but in the second command you have to remove the last backslash, then it works!
 
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