no response to sansa wiev .on windows 7 computer.

have been using for years my sasa wiev E 300 but my coputer ,  windows 7  does not respond at all when  I plugin the player in any- any! port . no reponse at all !!!  what can I do !?      Also there is no mention in any place of  my model    E300  14 GB sansa wiev , as if this player does not exist at all!!