ACPI.Sys Corrupt or Missing, Reboot Loop, Cannot Access Repair tools

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Bkis1969

Good afternoon, I am experiencing issues in a large enterprise environment with both WIN2k8 and WIN2k12 (Mostly 2k8). We applied the November 18 Patch Tuesday release and over 100 servers are unable to boot. The error is ACPI.sys is corrupt or missing. The repair tools are inaccessible because of a constant reboot loop. They display 'Windows is Repairing your System' it then times out and reboots again. It is occurring in a disproportionate number of virtual servers but some physical servers are now being affected. We are being forced to rebuild systems to resolve the issue. This issue is spreading. It occurs after the servers are rebooted to apply the patches. All patching has been halted. Due to the nature of our network and enterprise I am unable to display logs. Has this issue been reported anywhere else? Is there a root cause identified?

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