By default, Rulers and Gridlines are concealed in Word 2010. To make them apparent on Word window, you have got to enable these options manually. For showing Rulers, Gridlines, head over to View tab and under Show group, enable Ruler and Gridlines options.
Here you can see Rulers are enabled now.
Gridlines comes in handy especially when you need to align the text, images and embedded objects in Word document.