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OL97: Error Message: Outlook.exe Is Not a Valid Win32 Application

This article was previously published under Q258794
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
When you start Outlook, you may receive the following error message:
Outlook.exe is not a valid Win32 application.
The Outlook executable file (Outlook.exe) may be damaged.
To resolve this problem, you must rename the Outlook.exe file, remove Outlook, and then reinstall Outlook:

Rename the Outlook.exe File

  1. Click the Start button, point to Find, and then click Files or Folders.
  2. Type outlook.exe.
  3. Click the letter for your hard disk, click to select the Include subfolders check box, and then click Find Now.
  4. When the file has been found, right-click the file name, and then click Rename.
  5. Rename the file to "Outlook.old."
  6. If you receive a prompt with a warning message, click Yes.

Remove and Reinstall Outlook

  1. Click the Start button, point to Settings, and then click Control Panel.
  2. In Control Panel, double-click Add/Remove Programs.
  3. On the Install/Uninstall tab, click either Microsoft Office 97 or Microsoft Outlook 97, and then click Add/Remove.
  4. In the Setup Maintenance Program dialog box, click Add/Remove, and then click to clear the Outlook check box.
  5. Click Continue to remove only Outlook components.
  6. When prompted if you want to remove the shared Windows Messaging component, click Keep to keep these components.

    When the remove procedure finishes, you may need to restart your computer.
  7. Click the Setup.exe file from your Office 97 or Outlook 97 compact disk to reinstall Outlook.

Article ID: 258794 - Last Review: 01/27/2007 00:59:21 - Revision: 1.1

  • Microsoft Outlook 97 Standard Edition
  • kbprb KB258794