Connect the line out jack of your cassette player, to the line in jack on your computer's sound card then download & install the free audacity programme.
You can then record the sound from the cassette player.
You can get Audacity from here http://audacity.sourceforge.net/download/
There are great instructions here http://wiki.audacityteam.org/index.php?title=Transferring_tapes_and_re cords_to_computer_or_CD
This answer was edited by hongkongpom 14 days ago.
Reason: added URL

