Outlook calendar problems after Windows Defender definition update

Hi
Recently a Windows Defender definition update has been automatically applied to my Win 7 system. Immediately after this I am unable to access my calendar in Outlook - email, tasks etc all ok, just when accessing my calendar Outlook hangs and I have to kill it off. I have reset my laptop to a known, safe restore point several times but each time the update occurs and the problem re-occurs.

I do not run automatic updates but this one is seen as citical and is applied. I have even tried to hide the update but no luck.

Anyone else having the problem? Any ideas on how to fix it?

Thanks
 
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