I opened a sharepoint site. But I find that I can't choose the "Explorer View", only "All Documents", "Modify this View", "Create View", "Configure Views for This Location" menus displayed.
How can I configure to see the "Explorer View" ?
Explorer View doesnt exist in 2010 appart from when you have the library tab.
http://techtrainingnotes.blogspot.co.uk/2010/05/sharepoint-2010-windows-explorer-view.html
and this:
Explorer view
Removed in SharePoint Foundation 2010. Libraries that have been upgraded from earlier versions of SharePoint Foundation 2010 may still have Explorer views and these may not work.
I guess you are trying to see a view for a Document Library (from the 'All Documents' you specified). Is this for 2010 or 2007? If its 2010, You have to choose the option "Open with Explorer" in the ribbon.