Corrupted Email Storage Files

Running Windows 7, 64bit.  Windows Live Mail.My Live mail program flashed a message on the screen, which disappeared to quickly to read, however all of my email storage files disappeared and were recovered when the mail program was restarted . . . or, they appear to have been recovered, as the files are listed in each folder.  However, when you click on any given message in the folder they all come up with the same meassage.  When I tansfer a current email to the folder it too becomes the same message for all of the files.  It appears that the files have been recovered, as this is not true for every folder.  Some folders work just fine and each message comes up independently.  I have some very important data in those storage files and need to access each message.  Has anyone experience this problem?