MAPI error message when import or export messages in Outlook Express

If I try to import messages into Outlook Express, I receive the following error message:
Messages can not be imported from the MAPI client. An error has occurred.
If i try to export messages from Outlook Express, i receive the following error message:
The Export could not be performed. An error occurred while initializing MAPI.
anybody knows the solution to the my problem?

MAPI error message when import or export messages in Outlook Express