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Win2012R2 Hyper V "Integration Services Setup" upgrade fails & causes error Code 52 for important Hyper V drivers

Last Modified: 2017-12-30
Our Windows Server 2012 R2 Hyper V server hosts a Windows Server 2012 R2 VM. An update brought an Integration Services Setup upgrade to version 6.3.9600.18692 (I haven't had time to locate which update this is). This upgrade doesn't appear to complete successfully in the VM, and a number of critical devices (including the NIC) have an exclamation sign on them. The Device status in the device properties says:
"Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)"

After much research, I was able to implement a temporary fix by pressing F8 on the VM's boot, and selecting "Disable Driver Signature Enforcement". The VM then boots into the OS fine, and the devices do not have an error.

But this is just a temp (and potentially unsafe) fix. This appears to have occurred previously when Integration Services Setup upgraded to version 6.3.9600.18398, with MS releasing a "fix".

I would like to resolve it permanently. Any help would be greatly appreciated.
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