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To do this manually, download the file http://ctldl.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab (updated twice a month). Using any archive program (i.e. 7-Zip, or Windows Explorer) unpack authrootstl.cab to get the authroot.stl file from within. Right click on the authroot.stl file in windows explorer and click on "Install ...


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I'd tried most of the above after an annoying file causing fault on backups each night this week. Stumbled on this and tried a few extra things but still couldn't find what was locking it mind. If it helps anyone else, in this case there was a ".TMP" file in a shared folder. One user had an excel sheet in the folder open, another just had the ...


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