Missing PDFMaker in Word 2003

Hi,
 
I am using Acrobat Pro Extended 9.3.1 on WinXP Pro SP3 and in Word 2003 with no problems whatsoever ... until now.
 
Whenever I wanted to create PDF from a Word document, I just simply go to - View > Toolbars > Acrobat PDFMaker 9.0. in Word 2003 to activate the PDFMaker icon on the Word toolbar. With that, you just click on the Create PDF to convert your Word document to PDF.
 
But recently when I go to - View > Toolbars > ... I don't see the option for Acrobat PDFMaker 9.0. anymore!
 
I can't seem to figure out where it went.
 
Does anyone know how to reactivate this or how I can get it back in Word 2003?
 
Many thanks,
Ken