Unins000.Msg Is Missing

This article provides steps to diagnose "Unins000.msg is missing" error during an uninstall process.

System Repair Tool Step 1

Unins000.Msg? Download Error Scanner

Reginout System Utilities (w/ Verisign Digital Certificate) Compatible w/ Windows 10/8.1/8, Windows 7, Vista/XP. By clicking to download, you agree to these Terms See Features & Functions

Delete Spyware Entries from the Registry

A spyware may have created new entries in your Registry that might have to be looked after. Fire up the Registry Editor program, check for the specified Registry sub keys, and if found, please delete them.


For Windows 8.1/ 8:

  • Press Windows Key + C.
  • The Charms Bar will appear on the right-corner of the screen.
  • Click the Search icon.
  • The Start Screen will appear with Search feature.
  • Type "RegEdit" in the Search Box.
  • Click the Apps icon.
  • Open that from the Search Results.
  • Registry Editor will open. Locate the following sub key:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\CompatibilityAdapter\Signatures
  • Delete the following string:
    PC Optimizer Pro startups.job
    (It may have a value something like "PC Optimizer Pro startup.job.fp")
  • Locate the following sub key:
    HKEY_CLASSES_ROOT\CLSID\{EB5A3A22-ECA7-4
  • Delete the following string:
    PCOptProCtxMenu
  • Delete the following Registry sub keys:
    · HKEY_CURRENT_USER\Software\PC Optimizer Pro HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\PCOptimizerPro
    · HKEY_CURRENT_USER\Software\Microsoft\Win Menu2\Programs\PC Optimizer Pro
  • Exit the Registry Editor and Restart your computer for the changes to take effects.

For Earlier Versions of Windows:

  • Click the Start button on your Taskbar.
  • Type "RegEdit" in the Search Box.
  • Press ENTER.
  • Refer Steps # 8-13 from Windows 8.1/ 8 user’s paragraph.

Use a Third Party Uninstaller

A third party Uninstaller program lets you uninstall programs that display an error message during the setup operation. You may have to download a third party Uninstaller, select the program that encounters error and remove it completely. It is important to note that the third party Uninstaller is needed as it removes traces from the Registry which are the main reason behind an error message.


For Windows 8.1/ 8 and Earlier Versions:

  • Download Intel SOFTWARE Partner RegInOut.
  • Install and run the program.
  • Click the Uninstaller tab.
  • Uninstall the program which encounters Unins000.Msg Is Missing error message.

Restore the PC to the Point before the Program was Actually Installed

Restore your PC to an earlier point before the program was actually installed. The program will be automatically removed during the system restore process. The steps are given below:


For Windows 8.1/ 8:

  • Right click the Computer desktop icon.
  • Select Properties.
  • Click "Advanced system settings" link.
  • Click the System Protection tab in the System Properties dialog.
  • Click the System Restore button.
  • Follow the on-screen instructions.

For Earlier Versions of Windows:

  • Click the Start button.
  • Type "System Restore".
  • Press ENTER.
  • Follow the System Restore wizard.

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