Having searched the knowledge base and forum I cannot find an answer so started a new topic. I am unable to play embedded sounds in a pdf file in either Acrobat Standard 8.1.2 or Acrobat Reader on desk top. Operating system is XP Home. The same file plays sounds properly on my lap top running XP Home and Acrobat 7. Desk top plays mp3 and other sounds properly. Have compared Acrobat multimedia preference settings between two machines--they are the same. Suggestions.