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oledlg.dll is missing (system error with Application Control installed on Windows Server Core)
Technical Articles ID:   KB81993
Last Modified:  12/10/2015


McAfee Application Control (MAC) 6.x
Microsoft Windows Server 2012 Core
Microsoft Windows Server 2012 R2 Core
Microsoft Windows Server 2008 Core
Microsoft Windows Server 2008 R2 Core


After logging onto the system, a PluginWindowClass: McTray.exe - System Error Windows dialog box appears and displays the following error:

The program can't start because oledlg.dll is missing from your computer. Try reinstalling the program to fix this problem.


Windows Server Core has minimal features to support specific server roles. oledlg.dll is not included with the Windows Server Core installation.


There are two options:

Option 1 - Copy oledlg.dll to Windows Server Core

Copy oledlg.dll from a full installation of Microsoft Windows Server to the C:\Windows\System32 (32-bit installations) or C:\Windows\SysWOW64\ (64-bit installations) directory on Windows Server Core.

Option 2 - Delete the McAfee Solidifier registry key

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. Click Start, Run, type regedit, and click OK.
  2. Select Edit, Find, type \HKLM\SOFTWARE\Wow6432Node\McAfee\McTray\Plugins\McAfee Solidifier, and click Find Next.
  3. Right-click the \HKLM\SOFTWARE\Wow6432Node\McAfee\McTray\Plugins\McAfee Solidifier registry key and select Delete.

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