Windows 7 Problem opening Outlook Express email program

Assuming that you do mean " Outlook Express ".

Windows Vista and Windows 7 do NOT support Outlook Express which is designed for Windows XP.
excerpt :
Outlook Express isn't available in Windows Vista or Windows 7—you can't download it or run it on either version of Windows. However, you can install an e‑mail program from another company or use Windows Live Mail—a free program that is part of Windows Live Essentials.