No that is no longer possible as "Computer" and "Windows Explorer" are one and the same since Vista. But with Classic Shell, you do get a quick button to toggle the navigation (folders) pane.
Remembering an individual folder's size or position also is removed starting with Windows 7 but there is a third party program/hack called ShellFolderFix that can do it:
http://www.sevenforums.com/free-develop ... -size.htmlNote that Classic Shell is not responsible for third party apps recommended in this forum.