Check Out ErikEspangberg:
http://www.youtube.com/user/ErikEspan...
Things you will need:
1). A Computer with a line in or microphone port ( both work the same).
2). Either a Portable cassette player ( I use a sony walkman).
3). Or a Cassette Deck ( Im using an old Sanyo deck).
4). Male to Male 3.5mm audio jack ( If your using a portabe cassette player).
5). RCA to Male 3.5mm audio jack ( if your using a cassette deck).
6). NCH Wavepad Software: (When the free trail runs out go to your computers controll pannel and click uninstall when they offer you the free version accept all of the features shown in the video will still be functional)
http://www.nch.com.au/wavepad/index.html
EDIT: 2/1/16
If the Wave Pad software isn't working for you try Audacity:
http://www.audacityteam.org
Please don't forget to:
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