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System crash (blue screen) BugCheck 50 occurs during upgrade to VirusScan Enterprise Patch 10
Technical Articles ID:   KB90224
Last Modified:  1/26/2018


McAfee VirusScan Enterprise (VSE) Patch 10

Microsoft Windows Servers

For details of VSE supported environments, see KB51111.


System crash (blue screen error) can occur during an upgrade from an earlier (older) VSE version to VSE Patch 10.

Bugcheck Analysis key details:
  • Bugcheck 50
  • PROCESS_NAME: DAInstall.exe mfeaack+8bad (AV_mfeaack!unknown_function)
  • PROCESS_NAME: DAInstall.exe (mfeaack!CAacSys::ReportEvent+0x1dd)


The system crash is the result of an improper cleanup of clifton driver (mfeclftk.sys). It was unloaded without properly being de-registered.



VSE 8.8 Patch 11 will remove the Clifton driver to prevent a system crash.



The content of this article originated in English. If there are differences between the English content and its translation, the English content is always the most accurate. Some of this content has been provided using Machine Translation translated by Microsoft.

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