Help Archos gmini400 cannot upload to it

Hi there, please let me say thanks for the help you are about to give me, but i cannot seem to upload any of the movie or music files using windows media player version 11 onto our archos 400, we have two archos 402e's and it works great, i read where we had to do the software upload and we did that, but still it does not recognize the archos 400, by right clicking on a file and sending it to the archos 400 i can get it to go, but when we play a movie back it is out of time with the audio, the lips are moving a few seconds too late for the words, it gets irritating, does any one know how i can upload through media player or some other software i can use to upload the movies with success,,,,,,,,,,thanks, all for the help,,,,,,,,brenda