If it's more than a 'View' problem, you might need to repair your Microsoft Office installation:
Close Word (and any other Microsoft Office programms you've got running). Go to your list of installed programs, right-click on Microsoft Office and select 'Change'. If you're offered different ways of repairing the installation, choose the 'online' one then click on 'Repair'. Once the repair has finished, restart your computer and see if Word is working properly again for you.