Windows Defender not updating to the latest definitions.

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Bit of a strange one here, for the past 3 days I have not been unable to update to the latest definitions whether it be through Windows Update, Windows Defender, manual updates or through using a command prompt.


The latest definition I had was 1.271.815.0 on 11th July.


After using a command prompt I removed all prior definitions and it automatically updated to 1.271.760.0 from 10th July,


Attempts to since update this to the latest definitions have thrown up the usual error messages,


Windows Defender says protection updates are "up to date".


I have a Surface Pro 4 with Windows 10 version 1703.


Thanks!

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