Microsoft added a "nice to have" feature in windows 7 for marking files and directories using check boxes. Many of you will find it very hard to be familiar with this feature. Anyway, to operate it:
1.Press "Start" button < "control panel" < open the "folder options".
2.Press the "view" tab.
3.Check the "Use check boxes to select items".
4.From now on, any mouse move on a directory or file will place a select box aside it.