Click the Start button, type folder options and click the "Folder Options" link that appears.
When the "Folder Options" multi-tabbed dialog box appears, click the "View" tab.
Underneath "Advanced Settings", check "Always Show Menus".
Click "OK" to close the dialog box.
Registry hack
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Toolbar
For Windows Explorer: In the right pane, locate the Explorer sub-key and open it. In the right pane, locate the ITBarLayout value. Right click this value and select Delete.
For Internet Explorer: In the right pane, locate the WebBrowser sub-key and open it. In the right pane, locate the ITBarLayout value. Right click this value and select Delete.
Quit Registry Editor.
Open the affected program (Windows Explorer or Internet Explorer) and verify that you're Menu bar/Toolbar has been restored. If not, close all open Windows Explorer and Internet Explorer Windows and repeat the above step. Then locate the ShellBrowser sub-key, open it and delete the ITBarLayout value there.