I want to rollback to IE6 (from IE7), but under control panel the "change/remove" tab is not there?

I have had many problems with IE7 including toolbars; they are not locked and do not have the perforated separator (that enables you to move or combine toolbars). I literally have 4 toolbars up top that cannot be moved along with an additional "search default" box that cannot be removed without adding a new one. Any advice would be greatly appreciated.