Here is given an simple trick to activate the checkbox in the Windows Explorer detail view (Windows 7)
Click Start > type "folder options" (without quotes) in search column, then press Enter
In the Folder Options click view tab, then put checks in the item named "use check boxes to select the items", then press OK
Now open Windows Explorer, try to see a folder, if you hover the mouse over a file, then a checkboxes will appear on it's left side
This feature become handy and helpful especially when we want to select multiple files for further operations without having to hold down the Ctrl or Shift or by blocking it by mouse.