Converting word to pdf: all fields change to field codes

Hi Forumer

I got a problem to convert a Word file to pdf file, directly or by printing it.

The error is that all fields (page numbers, equations, etc) in Word are converted to field codes in pdf file. For example: the page number becomes: {PAGE}, etc.

I never get this kind of error before.
I use Adobe 6.0 Pro, and Ms Word 2003.

I'll appreciate your help.

Regards,
Wijono
Malaysia