Numbered Lists in MS Word 2007?

Have the ruler visible if you don't already. Click on any of the numbers under 100 and note the tab in the ruler. It is set to a very small tab space. When the number 100. is reached, it exceeds the space allowed by the tab placement so it goes to the next default stop which is .5 inches. To solve this, highlight your list (all of it) and go to the ruler and move the tab stop (upward pointing triangle) to the right until all text lines up correctly.