Binoculars
From your above post it seems you finally got fed up.
To check if you've still got OE installed go to Add/Remove programs menu and click on windows options.
Check the list, if there is a tick next to Outlook Express clear it and press OK. Windows will uninstall it.
Now repeat the above but this time put a tick next to OE and press OK.
Windows should reinstall it from its own files.
(shouldn't need a disk or anything as the files required are contained in the Windows O/s
Thats for Windows 98 etc.
If you've got XP I ain't got a clue.