In a few major Windows apps, the familiar old top menu bar has disappeared. (That is, the one containing the File, View, and such crucial menus.)
To keep the menu bar always visible in Internet Explorer 8, first hit the Alt key to bring up the bar (comprising File, Edit, View, Favorites, and so on).
Then, right-click on the menu bar itself. On the context menu that pops up, you’ll see that the Menu Bar entry (the topmost in the list) is not checked off.
Left-click on Menu Bar to check it, and that should lock the old-school bar back in its familiar place: