recently when opening OUTLOOK EXPRESS and trying to open an Inbox Folder.. I get the message"

Folder could not be displayed " and "Outlook Express Cannot open this folder"... Every time I

open Outlook Express, I happens to a different inbox folder... I have deleted the impacted folder's

DBX file and it rebuilds it when the computer is restarted then another folder won't open and gives me

the same message... Any ideas what is causing this?  What can I do?  I don't want to lose my

emails..