Checkboxes is a one such useful feature introduced with window vista, the same applies to windows 7 but for any reason you are not seeing the checkboxes in windows 7 then, follow the procedure given below to enable check boxes in windows 7
1. Open Windows Explorer by pressing Win+e key on the keyboard
2. Now navigate to folder options in file menu as shown in the image below
3. Click the view tab and scroll down to locate the setting Use Check boxes to select items in the newly opened window and check the box for this setting [ as highlighted in the image below ]
3. click ok, that’s it you will now see check boxes in windows 7 when you select multiple files.
Also Read: Enable Check Boxes In Windows 7