I am having a problem with Outlook Automation, I have a solution but I would
like to automate the solution so the users won't have to manually do the
steps in Outlook to fix the problem.  

Here is the message my users sometimes get:

"The custom form could not be opened. Outlook will use an Outlook form
instead.
The form required to display this message could not be opened."

To resolve this problem, use one of the following methods:• Clear the Custom
Forms cache in Outlook 2003. To do so, follow these steps:

1. On the Tools menu, click Options.
2. On the Other tab, click Advanced Options.
3. In the Advanced Options window, click Custom Forms.
4. In the Custom Forms window, click Manage Forms.
5. In the Forms Manager window, click Clear Cache.
6. Click Close.  

Here is the link on MSDN if you need more information
http://support.microsoft.com/?id=836558