Missing IE address bar

I have a computer that recently lost the address bar in internet explorer. I went through the basic steps of going to View, Toolbars, address bars it shows it as installed and expanded all of the tool bars to see if it was hidden. I have also ran a XP toolbar fix program and still no luck. As a last ditch effort I copied the regestry keys for HKEY_CURRENT_USER\Software\Microsoft\InternetExplorer and still no tool bar. Any help with this would be greatly appreciated