Word (2010): There is insufficient memory or disk space. Word cannot display the requested font

My wife's laptop is a MacBook Pro running Windows 7 under BootCamp. It's a fast machine but when she tries to open an existing Word document or make a new blank one she gets the error message "There is insufficient memory or disk space. Word cannot display the requested font" and some of the layout is garbled. As you can see from this screenshot less than half of the 2.16 of usable RAM is in use and 180GB of the 232GB of hard drive are free. Word should not be running out of memory at all.

I have tried

1. Deleting the normal template
2. Disabling all add ons and ins

None of these work. What is going on and how should I fix it?

I could not work out what was wrong with the installation but

1. Go to Control Panel -> Programs and Features
2. Select Microsoft Office 2010 from the list
3. Click 'change'
4. Choose 'repair'

fixed it