iCal not showing days in week view

I think the best way to explain this is to see the attached pictures. Is there anyway to get iCal to start showing the names of the days along the top in week view? It used to, and all the pictures I've looked up online show iCal with the days of the week.

If this isn't a setting, and there's something wrong with my iCal, how do I go about uninstalling it and reinstalling it?

Thanks in advance!