try this..Unistalling it from add/remove windows components and removing it...reboot then install it again.
While there is no option within Outlook Express to turn the splash screen off, you can remove it via the system registry. Start regedit from the Run... menu and travel down to HKEY_CURRENT_USER \ Identities \ (Your Identity) \ Software \ Microsoft \ Outlook Express \ 5.0. On the right pane, create a new DWORD with the right-button context menu and name it "NoSplash". Double-click the DWORD to modify it and enter "1" as the value in the dialog box.
Close regedit, start Outlook Express, see no splash screen.