Most stereos have an RCA output that you can connect to the computer's sound card; if not, you can use the stereo's mini-plug headphone jack to send audio to the computer. After connecting the stereo to your PC, you can record its audio output using the GoldWave audio editor. GoldWave is capable of recording CD-quality WAV audio without any additional plug-ins, and a free trial version of the program is available from the developer's website.
