This should remove the address bar and remove the option the re-add it.
Code:
$null = WriteValue("HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Toolbars\Restrictions","NoToolbarOptions",1,REG_DWORD)
$null = WriteValue("HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Toolbars\Restrictions","NoAddressBar",1,REG_DWORD)
