Is it recommended to replace (install through windows update) IE8 to IE9 in Windows7? Does it really entirely replace IE to newer version a on given system? (also Windows Explorer and all core files?). It seems that IE is tightly integrated with the system. I don't know that I should install IE9 or cumulative updates for IE8 - which method do you use and which brings less trouble? I don't use Internet Explorer as my main browser; I'm not that insane. I'm just curious that does Windows Update only installs update for browser but core files are kept the same, or it completely replaces IE to newest version?