I assume you have an HP printer installed? hpzui4wm.dll is a clue...
I'd try deleting all printers and reinstalling the drivers. If that doesn't work, try Word safe mode (start > run > type winword /a and hit enter). If that works, then step through this:
http://howtotroubleshoot.blogspot.com/2007/08/how-to-clean-word.html