Miguelito,
If you have Always create backup copy turned on in Word's options there is
perhaps a possibility to retrieve your pages. If you have not you are in
trouble.
Have a look here: http://word.mvps.org/faqs/general/AutomaticSave.htm
Luc
In addition, if you are a member of domain running on a Windows 2003 server
with shadow copy enabled, you can restore any previous version of the
document by opening explorer, navigating to the document, right-click and
selecting Properties.