OL2002: You Receive an Error Message When You Try to Open a Custom Form in Outlook (320835)

SYMPTOMS

When you try to open a custom form in Microsoft Outlook, you may receive one of the following error messages:

The form you selected could not be displayed. An error occurred registering the form in the OLE registry.

-or-

You do not have permission to send the message on behalf of the specified user.

You do not receive the error message when you use the form if you are logged on to the computer as Administrator or as a member of the Administrators group.

CAUSE

This behavior may occur if all of the following conditions are true:

You are logged on to a Microsoft Windows XP Professional-based computer or a Microsoft Windows 2000-based computer using a user account that does not have Administrator rights.

-and-
The user account does not have permissions to modify the following key in the Windows registry:

HKEY_CURRENT_USER\Software\Classes\CLSID
-and-
You open a custom form in Outlook.

RESOLUTION

To resolve this issue, rename the Frmcache.dat and Usrclass.dat files (if they are present) in the Default User profile and the profiles of the users who are experiencing the behavior described earlier in the "Symptoms" section of this article. To do this, follow these steps.

NOTE: Because there are several versions of Microsoft Windows, the following steps may be different on your computer. If they are, see your product documentation to complete these steps.

Log on to the computer as Administrator or as a member of the Administrators group.
Right-click Start, and then click Explore.
On the Tools menu, click Folder Options.
Click the View tab, and then in the Advanced settings list, under Files and Folders, do the following:
1. Under Hidden files and folders, click Show hidden files and folders.
2. Click to clear the Hide file extensions for known file types check box.
Click OK.
Locate the following folders, where drive is the drive on which Windows is installed, and UserName is the name of the user who is experiencing the behavior described in the "Symptoms" section of this article. There may be more than one user.
drive:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Forms
drive:\Documents and Settings\UserName\Local Settings\Application Data\Microsoft\Forms
Rename the Frmcache.dat file in each of the folders that you located in step 6:
1. Right-click the Frmcache.dat file, and then click Rename.
2. Type frmcache.old, and then press ENTER.
Locate the following folders, where drive is the drive on which Windows is installed, and UserName is the name of the user who is experiencing the behavior described in the "Symptoms" section of this article. There may be more than one user.
drive:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows
drive:\Documents and Settings\UserName\Local Settings\Application Data\Microsoft\Windows
Rename the Usrclass.dat file in each of the folders that you located in step 8:
1. Right-click the Usrclass.dat file, and then click Rename.
2. Type usrclass.old, and then press ENTER.
Quit Windows Explorer.

MORE INFORMATION

For additional information about how to troubleshoot forms, click the article number below to view the article in the Microsoft Knowledge Base:

201083 OL2000: Troubleshooting Forms That Don't Run on Other Computers

For additional information about working with custom forms in Outlook, click the article numbers below to view the articles in the Microsoft Knowledge Base:

146636 OL2000: Questions About Custom Forms and Outlook Solutions

271225 Resources for custom forms and programming in Outlook 2000

259662 OL2000: Designing Custom Forms for Different Versions of Outlook

For additional information about the Outlook forms cache, click the article numbers below to view the articles in the Microsoft Knowledge Base:

232303 OL2000: How the Forms Cache Works

232314 OL2000: How to Troubleshoot the Outlook Forms Cache

195754 OL2000: How to Clear the Outlook Forms Cache