I found the fix for this, incase anyone else encounters it.
The issue results from a corrupt update from iTunes.
The resolution is to re-install the Segoe UI windows fonts.
Simply take them from a working computer (ie windows 7 to windows 7) and re-install them on the computer that is not working.
The directory for the fonts is: C:\Windows\Fonts\Segoe UI
Be sure to install all 6 and reboot.
Hope this helps someone.