"If you have Acrobat Pro installed, you probably have the bundled Adobe LiveCycle 8 installed, as well. (Found in Program Files\Adobe\Acrobat 8.0\Designer 8.0\FormDesigner.exe)
There is an option when creating a new form: Import a Word Document
I haven't tried it because it's apparently incompatible with Word 2007 but I think it was designed for 97-2003.
Create a PDF from the Word doc and then run 'Form Field Recognition' from the Acrobat 'Forms' menu. This usually does a fairly good job of auto-creating the form fields. You may well need to tidy up using the tools on the 'Forms' toolbar afterwards though.