internet explorer toolbars,,need help

hi in internet explorer,the search option will not work,when i press it the window comes up but it says ,the page cannot be displayed, the same message as when you type the wrong address.
i went into customize search settings and theres 2 options, search works when i put it to ,use one search service, but does'nt work on the normal one i use which is ,use search assistant, it says the page cannot be displayed, does anyone know how i can fix this,every other toolbar option works.
ben