Hi
How exactly are you trying to record.
If you mean you plugged in a MIcrophone and then played the track and tried recording it then your recording input was set to microphone, It is hard to record from things like WMP and the like although I did find a nice tool for it, however it limits you to recording from one source or another and not 2 at the same time.
To achieve what you want to do (assuming my above statement was correct) is to output the laptop (sound and voice) to another recording medium such as another PC or minidisk etc
Regards