Outlook fails with the occurrence of Riched20.dll Error Messages

When you try starting MS Outlook, you might receive the following errors:

Outlook.exe caused an ‘access violation’ fault in module Riched20.dll at 014f:4802bc95.


Outlook caused an Invalid Page Fault in Riched20.dll.

Now if you click OK, Outlook fails to start. Or Outlook may start but when you try to create a new mail message you receive the following error message:

Unable to load “riched20.dll”. You may be out of memory, out of system resources, or missing a .dll file.

The reason behind the occurrence of these error messages is that the file Riched20.dll is missing or damaged. To resolve this issue, rename the Riched20.dll file, if it exists and repair Outlook. To rename the Riched20.dll file, follow the steps given below:

  1. Click Start, point to Find, click Files or Folders. In the Named box, type Riched20.dll and click Find Now

  2. In the Search Results list, right-click Riched20.dll and then click Rename on the shortcut menu. Rename the extension “.dll” to “.old”.

Now repair Outlook:

  1. Click Start, point to Settings and click Control Panel

  2. In Control Panel, double-click the Add/Remove Programs icon

  3. In the list of installed program, select either MS Outlook or MS Office (as you’ve installed the application)

  4. Click Add/Remove

  5. Once the setup screen appears, click Repair Office

  6. Click “Repair errors in my Office 2000 installation,” and then click Finish

The repair process will take several minutes while Office Setup repairs any damaged or missing files. If prompted to restart the computer, click Yes and perform system restart.

Basically, Riched20.dll is the source library for Rich Text Editing and display features in Outlook, notably with MS Word or MS Outlook Rich Text selected as the default email format. Problems with this dll file may be apparent at startup as it makes the user unable to read text in the Outlook Preview pane. But by renaming the file and repairing Outlook, you can get rid of this issue.

In case the corruption is severe, use a competent PST Repair software to repair corrupt PST file.