My Wndows Live Mail will not open.

The message :- Windows Live Mail cannot be started.

The application was unable to open Windows Live Mail message store.

Your Windows Live Mailbox data is currently is currently being used by another program, such as a virus scanner.

Close the program or wait for it to complete it's operation, then open Windows Live Mail again.

The error notice is 0x800C0155.5

Does anybody know how to fix this problem.

I have done uninstall/reinstall. Closed all checking programs. Spybot, AVG to no avail.