Microsoft Internet Explorer 8 "keep getting pop display" Questions

keep getting a box popping up talking about script errors. how do we stop that? seems to happen in yahoo and youtube If you use Internet Explorer as your Web browser, chances are you have experienced,

pop-up window will display the username, password and server address for the selected item. Mac Instructions Log on to your MacIntosh computer with an administrator account. Open a new "Finder" window

...pop-ups. Occasionally, some of these programs can cause more harm than good. If they are outdated and incompatible with IE8, the browser is likely to freeze and crash frequently. Also, if add-ons are ...