Try this: Open your document in WordPerfect, go to the Print dialog, select the Acrobat Distiller printer, and select "Print to file". Now when you print, WordPerfect should create a PostScript file with a ".ps" or ".prn" file extension. Now start up the Acrobat Distiller application, and then open the PostScript file that WordPerfect created with the Distiller application. Do you get a PDF?
Also, what *exact* versions of Acrobat and Windows are you using?
-Mike Nitabach