duplicating wind

I flunked blender basics…just want to duplicate my wind emptys and move them over so I can take my animation from 500 frames to 1000. I Shift D them but they always return to the same place as the original when I go to a differant frame. I need to solve the basics of this because it happens with almost everything I duplicate. Ive waisted to much time on this. Need to go back to Blender school. First grade…Thanks. Cindy

I had this problem once, it could be that for you too. You may have enable auto-keyframing (the red dot button in the Timeline window). Check out the IPO window if these objects are keyframed after you have moved them.