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Hyper-V VMs using pass-through disks do not boot after installing VirusScan Enterprise 8.8 Patch 5
Technical Articles ID:   KB84987
Last Modified:  3/27/2017


McAfee VirusScan Enterprise (VSE) 8.8 Patch 5

Microsoft Hyper-V


VM systems that use the Hyper-V platform with pass-through disks may not boot after VSE 8.8 Patch 5 is installed.

System Change

VSE 8.8 Patch 5 was installed.


This issue is resolved in VSE 8.8 Patch 6.

Patches are cumulative; Technical Support recommends that you install the latest one.

Updates are available when you log on to the ServicePortal at: https://support.mcafee.com/downloads.


Disable the mfedisk.sys driver in the registry:

CAUTION: This article contains information about opening or modifying the registry.
  • The following information is intended for System Administrators. Registry modifications are irreversible and could cause system failure if done incorrectly.
  • Before proceeding, Technical Support strongly recommends that you back up your registry and understand the restore process. For more information, see: http://support.microsoft.com/kb/256986.
  • Do not run a REG file that is not confirmed to be a genuine registry import file.
  1. Back up your registry.
  2. Navigate to the following key, and modify the UpperFilters value by removing ONLY mfedisk in the string:  
  3. Reboot the system.


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