I have used a cheapish cassette walkman to transfer over 200 cassettes to MP3. Plug the lead as described above into the headphone jack and the other into your PC.
I too can recommend Poldersbits as above for ease of use and price. You can get free progs but I could not get on with them - Poldersbits worked for me a little £ but ease of use. Editing needs a little practice but as miskin man says it will do automatic track cuts - but beware many folk songs have long gaps in their delivery and this can confuse the program. One song by Anne Fentiman was cut into 12 or more 'tracks' and needed to be 'edited' and joined together - but it took only a few seconds to do so.
Take advantage of free trials before buying - you will find something to your satisfaction eventually. I do store all my tracks as MP3 (to save a lot of space on your computer) and I simply use a little program to create a WAV file again when I want to burn a CD.