The custom form could not be opened. Outlook will use an outlook form

Hi
I have just installed Outlook 2002 on a Windows 7 Professional OS. I exported the Email Messages from WLM to Outlook. All went well until I opened any of the Outlook shortcuts, Inbox, Sent Items, etc. When I click on any of these, I get the pop-up: "The custom form could not be opened. Outlook will use an Outlook form instead. The object could not be found". I have installed the 2.0 Hot Fix for Outlook and deleted FRMCACHE.DAT from the FORMS folder. I sure would appreciate some help with this.
The computer I'm working with is a Dell Latitude E5500. Intel Core 2 Duo, CPU 2.40 GHz., RAM 2.0 GB, 32 bit, 150 GB hard drive.

Thanks

Outlook 2002 is now an old program. As far as I know it is no longer supported by MS, so would be prone to virus infections etc.
From what I have seen when searching the web Outlook 2002 is not really compatible with Window 7 & is prone to all sorts of problems.
You can do a web search by typing Outlook 2002 & Windows 7 & follow the results.
You should stick to your WLM program, uninstall Outlook 2002, then purchase if necessary a much later version of Outlook.