Try to reinstall OE.
To uninstall OE .
Click Start - Run - regedit.
Locate the following registry keys, right-click the registry key, and then click Delete:
HKEY_LOCAL_MACHINE\Software\Microsoft\Outlook Express
HKEY_LOCAL_MACHINE\Software\Microsoft\WAB
HKEY_CURRENT_USER\Identities
HKEY_CURRENT_USER\Software\Microsoft\Outlook Express
HKEY_CURRENT_USER\Software\Microsoft\WAB
HKEY_LOCAL_MACHINE \Software\Microsoft\Active Setup\Installed Components\{44BBA840-CC51-11CF-AAFA-00AA00B6015C}
HKEY_LOCAL_MACHINE \Software\Microsoft\Active Setup\Installed Components\{7790769C-0471-11D2-AF11-00C04FA35D02}
Quit Registry Editor.